Bài 32: Phép Trừ Số Có Hai Chữ Số Cho Số Có Hai Chữ Số
<h3 id="khaacutem-phaacute">Khám phá</h3> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/581-1662118706.png.webp" width="303" height="241" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-0" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-0" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div><p></p> <table style="border-collapse: collapse; width: 14.1089%;" border="1"> <tbody> <tr> <td style="width: 49.7143%; text-align: center;">Chục</td> <td style="width: 50.2857%; text-align: center;">Đơn vị</td> </tr> <tr> <td style="width: 49.7143%; text-align: center;"> <p>7</p> <p>-</p> <p>3</p> </td> <td style="width: 50.2857%; text-align: center;"> <p>6</p> <p>&nbsp;</p> <p>2</p> </td> </tr> <tr> <td style="width: 49.7143%; text-align: center;">4</td> <td style="width: 50.2857%; text-align: center;">4</td> </tr> </tbody> </table> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/582-1662118937.png.webp" width="84" height="136" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-1" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-1" loading="lazy"></p> <ul> <li>6 trừ 2 bằng 4, viết 4.</li> <li>7 trừ 3 bằng 4, viết 4.</li> </ul> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/583-1662118962.png.webp" width="310" height="240" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-2" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-2" loading="lazy"></p> <table style="border-collapse: collapse; width: 13.9233%;" border="1"> <tbody> <tr> <td style="width: 50.0027%; text-align: center;">Chục</td> <td style="width: 50.0027%; text-align: center;">Đơn vị</td> </tr> <tr> <td style="width: 50.0027%; text-align: center;"> <p>5</p> <p>-</p> <p>2</p> </td> <td style="width: 50.0027%; text-align: center;"> <p>2</p> <p>&nbsp;</p> <p>0</p> </td> </tr> <tr> <td style="width: 50.0027%; text-align: center;">3</td> <td style="width: 50.0027%; text-align: center;">2</td> </tr> </tbody> </table> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/584-1662119008.png.webp" width="79" height="133" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-3" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-3" loading="lazy"></p> <ul> <li>2 trừ 0 bằng 2, viết 2.</li> <li>5 trừ 2 bằng 3, viết 3.</li> </ul> <h3 id="hoat-dong">Hoạt động</h3> <h4>1. Tính:</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/585-1662119866.png.webp" width="651" height="133" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-4" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-4" loading="lazy"></p> <p>&nbsp;</p> <h4>2. Đặt tính rồi tính.</h4> <p>68 - 15; 79 - 59; 67 - 50; 88 - 33</p> <h4>3. Quả dưa nào ghi phép tính có kết quả lớn nhất?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/591-1662122644.png.webp" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-5" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-5" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div><p></p> <h4>4. Trong vườn cây ăn quả có tất cả 75 cây nhãn và cây vải, trong đó có 25 cây nhãn. Hỏi trong vườn có bao nhiêu cây vải?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/592-1662122687.png.webp" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-6" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-6" loading="lazy"></p> <h3 id="luyen-tap">Luyện tập</h3> <h4>1. Tính nhẩm (theo mẫu).</h4> <p>60 - 20 = ?</p> <p>6 chục trừ 2 chục = 4 chục</p> <p>60 - 20 = 40</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/601-1662122733.png.webp" width="159" height="174" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-7" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-7" loading="lazy"></p> <p>a) 70 - 50; 90 - 70; 40 - 10</p> <p>b) 80 - 10; 60 - 50; 90 - 20</p> <p>c) 40 - 30; 70 - 30; 70 - 40</p> <h4>2. Đặt tính rồi tính.</h4> <p>92 - 72</p> <p>65 - 25</p> <p>86 - 64</p> <p>77 - 53</p> <h4>3. Số?</h4> <p>a)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/602-1662122822.png.webp" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-8" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-8" loading="lazy"></p> <p>b)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/611-1662122834.png.webp" width="715" height="223" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-9" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-9" loading="lazy"></p> <p>&nbsp;</p> <h4>4. Một đống gạch có 86 viên. Bạn Rô-bốt đã lấy đi 50 viên gạch để xây tường. Hỏi đống gạch đó còn lại bao nhiêu viên?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/612-1662122876.png.webp" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-10" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-10" 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. Đặt tính rồi tính</h4> <p>a) 47 + 20; 67 - 20; 67 - 47</p> <p>b) 56 + 41; 97 - 56; 97 - 41</p> <h4>2. Bạn nào cầm thẻ ghi phép tính có kết quả lớn nhất?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/621-1662122950.png.webp" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-11" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-11" loading="lazy"></p> <h4>3. Đo chiều cao ba bạn rô-bốt được kết quả như hình vẽ. Hỏi bạn nào cao nhất? Bạn nào thấp nhất?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/622-1662122982.png.webp" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-12" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-12" loading="lazy"></p> <p>Trò chơi</p> <p>Hái nấm</p> <p>Dán các số: 6, 12, 34, 35, 50, 67 vào sáu mặt của con xúc xắc.</p> <p>Cách chơi:</p> <ul> <li>Chơi theo nhóm.</li> <li>Khi đến lượt, người chơi gieo xúc xắc để nhận được một số ở mặt trên xúc xắc. Hái cây nấm ghi phép tính có kết quả bằng số nhận được.</li> <li>Trò chơi kết thúc khi hái được 4 cây nấm.</li> </ul> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/631-1662123064.png.webp" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-13" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-13" loading="lazy"><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/632-1662123074.png.webp" width="715" height="679" alt="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-14" title="hinh-anh-bai-32-phep-tru-so-co-hai-chu-so-cho-so-co-hai-chu-so-343-14" loading="lazy"></p>