Bài 21: Số Có Hai Chữ Số
<h3 id="khaacutem-phaacute">Khám phá</h3> <p><strong>Các số đến 20</strong></p> <p><strong><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/41-1662031180.png.webp" width="222" height="202" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-0" title="hinh-anh-bai-21-so-co-hai-chu-so-319-0" loading="lazy"></strong></p><div><strong> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</strong></div><strong>10 </strong>quả cà chua<p></p> <p><strong>1 chục</strong> quả cà chua</p> <table style="border-collapse: collapse; width: 99.9265%;" border="1"> <tbody> <tr> <td style="width: 13.5969%;">&nbsp;</td> <td style="width: 13.5969%; text-align: center;"><strong>Viết số</strong></td> <td style="width: 13.5969%; text-align: center;"><strong>Đọc số</strong></td> <td style="width: 13.5969%; text-align: center;">&nbsp;</td> <td style="width: 13.5969%; text-align: center;"><strong>Viết số</strong></td> <td style="width: 13.6015%; text-align: center;"><strong>Đọc số</strong></td> </tr> <tr> <td style="width: 13.5969%;"><img style="float: left;" src="/uploads/tinymce/42-1662031343.png.webp" width="96" height="72" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-1" title="hinh-anh-bai-21-so-co-hai-chu-so-319-1" loading="lazy"></td> <td style="width: 13.5969%;">11</td> <td style="width: 13.5969%;">Mười một</td> <td style="width: 13.5969%;"><img src="/uploads/tinymce/47-1662031407.png.webp" width="135" height="70" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-2" title="hinh-anh-bai-21-so-co-hai-chu-so-319-2" loading="lazy"></td> <td style="width: 13.5969%;">16</td> <td style="width: 13.6015%;">Mười sáu</td> </tr> <tr> <td style="width: 13.5969%;"><img style="float: left;" src="/uploads/tinymce/43-1662031352.png.webp" width="108" height="72" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-3" title="hinh-anh-bai-21-so-co-hai-chu-so-319-3" loading="lazy"></td> <td style="width: 13.5969%;">12</td> <td style="width: 13.5969%;">Mười hai</td> <td style="width: 13.5969%;"><img src="/uploads/tinymce/48-1662031418.png.webp" width="133" height="70" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-4" title="hinh-anh-bai-21-so-co-hai-chu-so-319-4" loading="lazy"></td> <td style="width: 13.5969%;">17</td> <td style="width: 13.6015%;">Mười bảy</td> </tr> <tr> <td style="width: 13.5969%;"><img src="/uploads/tinymce/44-1662031377.png.webp" width="119" height="73" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-5" title="hinh-anh-bai-21-so-co-hai-chu-so-319-5" loading="lazy"><div> <div class="ads-horizontal-wrapped">
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</div></td> <td style="width: 13.5969%;">13</td> <td style="width: 13.5969%;">Mười ba</td> <td style="width: 13.5969%;"><img src="/uploads/tinymce/49-1662031426.png.webp" width="133" height="67" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-6" title="hinh-anh-bai-21-so-co-hai-chu-so-319-6" loading="lazy"></td> <td style="width: 13.5969%;">18</td> <td style="width: 13.6015%;">Mười tám</td> </tr> <tr> <td style="width: 13.5969%;"><img src="/uploads/tinymce/45-1662031391.png.webp" width="133" height="72" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-7" title="hinh-anh-bai-21-so-co-hai-chu-so-319-7" loading="lazy"></td> <td style="width: 13.5969%;">14</td> <td style="width: 13.5969%;">Mười bốn</td> <td style="width: 13.5969%;"><img src="/uploads/tinymce/410-1662031436.png.webp" width="136" height="70" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-8" title="hinh-anh-bai-21-so-co-hai-chu-so-319-8" loading="lazy"></td> <td style="width: 13.5969%;">19</td> <td style="width: 13.6015%;">Mười chín</td> </tr> <tr> <td style="width: 13.5969%;"><img src="/uploads/tinymce/46-1662031398.png.webp" width="133" height="72" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-9" title="hinh-anh-bai-21-so-co-hai-chu-so-319-9" loading="lazy"></td> <td style="width: 13.5969%;">15</td> <td style="width: 13.5969%;">Mười lăm</td> <td style="width: 13.5969%;"><img src="/uploads/tinymce/411-1662031442.png.webp" width="131" height="67" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-10" title="hinh-anh-bai-21-so-co-hai-chu-so-319-10" loading="lazy"><div> <div class="ads-horizontal-wrapped">
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</div></td> <td style="width: 13.5969%;">20</td> <td style="width: 13.6015%;">Hai mươi</td> </tr> </tbody> </table> <h3 id="hoat-dong">Hoạt động</h3> <h4>1. Biết mỗi túi cà chua có 10 quả cà chua. Tìm số thích hợp (theo mẫu).</h4> <p>a) <img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/51-1662031526.png.webp" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-11" title="hinh-anh-bai-21-so-co-hai-chu-so-319-11" loading="lazy"></p> <p>b)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/52-1662031542.png.webp" width="300" height="133" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-12" title="hinh-anh-bai-21-so-co-hai-chu-so-319-12" loading="lazy"></p> <p>c)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/53-1662031555.png.webp" width="286" height="120" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-13" title="hinh-anh-bai-21-so-co-hai-chu-so-319-13" loading="lazy"></p> <p>d)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/54-1662031566.png.webp" width="301" height="126" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-14" title="hinh-anh-bai-21-so-co-hai-chu-so-319-14" loading="lazy"></p> <p>&nbsp;</p> <h4>2. Số?</h4> <p>a)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/55-1662031589.png.webp" width="292" height="243" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-15" title="hinh-anh-bai-21-so-co-hai-chu-so-319-15" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div><p></p> <p>b)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/56-1662031599.png.webp" width="289" height="241" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-16" title="hinh-anh-bai-21-so-co-hai-chu-so-319-16" loading="lazy"></p> <p>&nbsp;</p> <h4>3. Số?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/57-1662031611.png.webp" width="705" height="338" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-17" title="hinh-anh-bai-21-so-co-hai-chu-so-319-17" loading="lazy"></p> <h3 id="luyen-tap">Luyện tập</h3> <h4>1. Số?</h4> <p>a)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/61-1662031661.png.webp" width="312" height="76" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-18" title="hinh-anh-bai-21-so-co-hai-chu-so-319-18" loading="lazy"></p> <p>b)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/62-1662031672.png.webp" width="316" height="73" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-19" title="hinh-anh-bai-21-so-co-hai-chu-so-319-19" loading="lazy"></p> <p>c)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/63-1662031682.png.webp" width="310" height="76" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-20" title="hinh-anh-bai-21-so-co-hai-chu-so-319-20" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <p>d)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/64-1662031695.png.webp" width="319" height="73" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-21" title="hinh-anh-bai-21-so-co-hai-chu-so-319-21" loading="lazy"></p> <p>e)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/65-1662031708.png.webp" width="310" height="70" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-22" title="hinh-anh-bai-21-so-co-hai-chu-so-319-22" loading="lazy"></p> <p>g)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/66-1662031720.png.webp" width="318" height="67" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-23" title="hinh-anh-bai-21-so-co-hai-chu-so-319-23" loading="lazy"></p> <p>&nbsp;</p> <h4>2. Quan sát tranh rồi trả lời.</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/67-1662031742.png.webp" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-24" title="hinh-anh-bai-21-so-co-hai-chu-so-319-24" loading="lazy">Trên bàn có:</p> <p>a) Mấy cái kẹo?</p> <p>b) Mấy gói quà?</p> <p>c) Mấy bông hoa?</p> <h3 id="trograve-choi">Trò chơi</h3> <p><strong>Đường đến Đảo giấu vàng</strong></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/71-1662031890.png.webp" width="172" height="157" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-25" title="hinh-anh-bai-21-so-co-hai-chu-so-319-25" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <p>Cách chơi:</p> <ul> <li>Chơi theo nhóm.</li> <li>Người chơi bắt đầu từ ô <strong>xuất phát</strong>. Khi đến lượt, người chơi gieo xúc xắc. Đếm số chấm ở mặt trên xúc xắc rồi di chuyển số ô bằng số chấm nhận được. Nếu đến hình tam giác thì đi tiếp theo hướng mũi tên.</li> <li>Đọc số trong mỗi ô đi đến.</li> <li>Trò chơi kết thúc khi có người đến được <strong>Đảo giấu vàng</strong>.</li> </ul> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/72-1662031880.png.webp" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-26" title="hinh-anh-bai-21-so-co-hai-chu-so-319-26" loading="lazy"></p> <p>&nbsp;</p> <h3 id="khaacutem-phaacute">Khám phá</h3> <p><strong>Các số tròn chục</strong></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/81-1662037985.png.webp" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-27" title="hinh-anh-bai-21-so-co-hai-chu-so-319-27" loading="lazy"></p> <h3 id="hoat-dong">Hoạt động</h3> <h4>1. Số?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/82-1662038012.png.webp" width="609" height="120" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-28" title="hinh-anh-bai-21-so-co-hai-chu-so-319-28" loading="lazy"></p> <h4>2. Tìm nhà cho chim cánh cụt.</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/83-1662038278.png.webp" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-29" title="hinh-anh-bai-21-so-co-hai-chu-so-319-29" loading="lazy"></p> <h4>3. Biết mỗi cây có 10 quả. Tìm số thích hợp (theo mẫu).</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/91-1662038305.png.webp" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-30" title="hinh-anh-bai-21-so-co-hai-chu-so-319-30" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <h4>4. Biết mỗi túi có 10 quả cả chua. Tìm số quả cà chua trên mỗi hàng (theo mẫu).</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/92-1662038339.png.webp" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-31" title="hinh-anh-bai-21-so-co-hai-chu-so-319-31" loading="lazy"></p> <h3 id="khaacutem-phaacute">Khám phá</h3> <p><strong>Các số đến 99</strong></p> <table style="border-collapse: collapse; width: 99.9265%;" border="1"> <tbody> <tr> <td style="width: 16.9242%;">&nbsp;</td> <td style="width: 16.9242%;">Chục</td> <td style="width: 16.9242%;">Đơn vị</td> <td style="width: 16.9242%;">Viết số</td> <td style="width: 16.9334%;">Đọc số</td> </tr> <tr> <td style="width: 16.9242%;"><img src="/uploads/tinymce/101-1662038468.png.webp" width="214" height="60" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-32" title="hinh-anh-bai-21-so-co-hai-chu-so-319-32" loading="lazy"></td> <td style="width: 16.9242%;">2</td> <td style="width: 16.9242%;">4</td> <td style="width: 16.9242%;">24</td> <td style="width: 16.9334%;">Hai mươi tư</td> </tr> <tr> <td style="width: 16.9242%;"><img src="/uploads/tinymce/102-1662038475.png.webp" width="244" height="61" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-33" title="hinh-anh-bai-21-so-co-hai-chu-so-319-33" loading="lazy"></td> <td style="width: 16.9242%;">3</td> <td style="width: 16.9242%;">5</td> <td style="width: 16.9242%;">35</td> <td style="width: 16.9334%;">Ba mươi lăm</td> </tr> <tr> <td style="width: 16.9242%;"><img src="/uploads/tinymce/103-1662038481.png.webp" width="265" height="123" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-34" title="hinh-anh-bai-21-so-co-hai-chu-so-319-34" loading="lazy"></td> <td style="width: 16.9242%;">7</td> <td style="width: 16.9242%;">1</td> <td style="width: 16.9242%;">71</td> <td style="width: 16.9334%;">Bảy mươi mốt</td> </tr> <tr> <td style="width: 16.9242%;"><img src="/uploads/tinymce/104-1662038488.png.webp" width="286" height="127" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-35" title="hinh-anh-bai-21-so-co-hai-chu-so-319-35" loading="lazy"><div> <div class="ads-horizontal-wrapped">
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</div></td> <td style="width: 16.9242%;">8</td> <td style="width: 16.9242%;">9</td> <td style="width: 16.9242%;">89</td> <td style="width: 16.9334%;">Tám mươi chín</td> </tr> </tbody> </table> <h3 id="hoat-dong">Hoạt động</h3> <h4>1. Số?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/105-1662038554.png.webp" width="715" height="388" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-36" title="hinh-anh-bai-21-so-co-hai-chu-so-319-36" loading="lazy"></p> <h4>2. Số?</h4> <p>a)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/111-1662038577.png.webp" width="672" height="118" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-37" title="hinh-anh-bai-21-so-co-hai-chu-so-319-37" loading="lazy"></p> <p>b)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/112-1662038599.png.webp" width="679" height="112" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-38" title="hinh-anh-bai-21-so-co-hai-chu-so-319-38" loading="lazy"></p> <p>c)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/113-1662038610.png.webp" width="676" height="112" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-39" title="hinh-anh-bai-21-so-co-hai-chu-so-319-39" loading="lazy"></p> <p>&nbsp;</p> <h4>3. Tìm cách đọc số ghi trên mỗi con chim cánh cụt.</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/114-1662038646.png.webp" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-40" title="hinh-anh-bai-21-so-co-hai-chu-so-319-40" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <h3 id="luyen-tap">Luyện tập</h3> <h4>1. Số?</h4> <p>a)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/121-1662038753.png.webp" width="235" height="100" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-41" title="hinh-anh-bai-21-so-co-hai-chu-so-319-41" loading="lazy"></p> <p><strong>42 </strong>gồm <strong>4 </strong>chục và <strong>2 </strong>đơn vị.</p> <p>b)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/122-1662038796.png.webp" width="292" height="88" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-42" title="hinh-anh-bai-21-so-co-hai-chu-so-319-42" loading="lazy"></p> <p>36 gồm ... chục và ... đơn vị.</p> <p>c)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/123-1662038814.png.webp" width="327" height="87" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-43" title="hinh-anh-bai-21-so-co-hai-chu-so-319-43" loading="lazy"></p> <p>... gồm ... chục và ... đơn vị.</p> <p>d)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/124-1662038834.png.webp" width="328" height="88" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-44" title="hinh-anh-bai-21-so-co-hai-chu-so-319-44" loading="lazy"></p> <p>... gồm ... chục và ... đơn vị.</p> <h4>2. Số?</h4> <p>a)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/125-1662038932.png.webp" width="157" height="145" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-45" title="hinh-anh-bai-21-so-co-hai-chu-so-319-45" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <p>57 gồm ... chục và ... đơn vị.</p> <p>b)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/126-1662038952.png.webp" width="157" height="160" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-46" title="hinh-anh-bai-21-so-co-hai-chu-so-319-46" loading="lazy"></p> <p>... gồm ... chục và ... đơn vị.</p> <h4>3. Tìm hình thích hợp với chim cánh cụt và ô chữ.</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/131-1662039057.png.webp" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-47" title="hinh-anh-bai-21-so-co-hai-chu-so-319-47" loading="lazy"></p> <h4>4. Quan sát tranh.</h4> <p>a) Tìm các số có một chữ số.</p> <p>b) Tìm các số tròn chục.</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/132-1662039087.png.webp" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-48" title="hinh-anh-bai-21-so-co-hai-chu-so-319-48" loading="lazy"></p> <h3 id="luyen-tap">Luyện tập</h3> <h4>1. Số?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/141-1662039205.png.webp" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-49" title="hinh-anh-bai-21-so-co-hai-chu-so-319-49" loading="lazy"></p> <h4>2. Số?</h4> <p>... gồm 3 chục và 7 đơn vị.</p> <p>... gồm 5 chục và 0 đơn vị.</p> <p>... gồm 8 chục và 4 đơn vị.</p> <p>46 gồm ... chục và ... đơn vị.</p> <p>72 gồm ... chục và ... đơn vị.</p> <p>91 gồm ... chục và ... đơn vị.</p> <h3 id="trograve-choi">Trò chơi</h3> <p><strong>Cánh cụt câu cá</strong></p> <p><strong><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/151-1662039481.png.webp" width="177" height="353" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-50" title="hinh-anh-bai-21-so-co-hai-chu-so-319-50" loading="lazy"></strong></p><div><strong> <div class="ads-horizontal-wrapped">
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</strong></div><p></p> <p>Cách chơi:</p> <ul> <li>Chơi theo nhóm.</li> <li>Người chơi bắt đầu từ ô xuất phát. Khi đến lượt, người chơi gieo xúc xắc. Đếm số chấm ở mặt trên xúc xắc rồi di chuyển số ô bằng số chấm nhận được.</li> <li>Câu con cá thích hợp với số ở ô đang đứng. Ví dụ, đến ô có số <strong>14 </strong>thì câu con cá ghi <strong>mười bốn</strong>.</li> <li>Trò chơi kết thúc khi câu được hết cá.</li> </ul> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/152-1662039465.png.webp" alt="hinh-anh-bai-21-so-co-hai-chu-so-319-51" title="hinh-anh-bai-21-so-co-hai-chu-so-319-51" loading="lazy"></p>