Bài 31: Phép Trừ Số Có Hai Chữ Số Cho Số Có Một Chữ Số
<h3 id="khaacutem-phaacute">Khám phá</h3> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/521-1662103319.png.webp" width="348" height="255" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-0" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-0" 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: 18.9356%;" border="1"> <tbody> <tr> <td style="width: 50.2262%; text-align: center;">Chục</td> <td style="width: 50.2262%; text-align: center;">Đơn vị</td> </tr> <tr> <td style="width: 50.2262%; text-align: center;"> <p>7</p> <p>-</p> </td> <td style="width: 50.2262%; text-align: center;"> <p>6</p> <p>5</p> </td> </tr> <tr> <td style="width: 50.2262%; text-align: center;">7</td> <td style="width: 50.2262%; text-align: center;">1</td> </tr> </tbody> </table> <ul> <li><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/522-1662103359.png.webp" width="109" height="145" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-1" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-1" loading="lazy">6 trừ 5 bằng 1, viết 1.</li> <li>Hạ 7, viết 7.</li> </ul> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/523-1662103382.png.webp" width="358" height="247" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-2" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-2" loading="lazy"></p> <table style="border-collapse: collapse; width: 16.8936%;" border="1"> <tbody> <tr> <td style="width: 50%; text-align: center;">Chục</td> <td style="width: 50%; text-align: center;">Đơn vị</td> </tr> <tr> <td style="width: 50%; text-align: center;"> <p>3</p> <p>-</p> </td> <td style="width: 50%; text-align: center;"> <p>4</p> <p>4</p> </td> </tr> <tr> <td style="width: 50%; text-align: center;">3</td> <td style="width: 50%; text-align: center;">0</td> </tr> </tbody> </table> <ul> <li><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/524-1662103416.png.webp" width="91" height="133" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-3" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-3" loading="lazy">4 trừ 4 bằng 0, viết 0.</li> <li>Hạ 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/531-1662103461.png.webp" width="643" height="142" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-4" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-4" loading="lazy"></p> <h4>2. Đặt tính rồi tính.</h4> <p>18 - 5; 46 - 4; 75 - 3; 99 - 9</p> <h4>3. Tìm chỗ đỗ cho xe ô tô.</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/532-1662103508.png.webp" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-5" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-5" 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. Một xe buýt chở 29 hành khách. Đến bến đỗ có 5 hành khách xuống xe. Hỏi trên xe buýt còn lại bao nhiêu hành khách?</h4> <p>... - ... = ...</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/533-1662103556.png.webp" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-6" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-6" loading="lazy"></p> <h3 id="luyen-tap">Luyện tập</h3> <h4>1. Tìm số thích hợp (theo mẫu).</h4> <p>a) 35 - 2 = ?</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/541-1662103595.png.webp" width="277" height="79" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-7" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-7" loading="lazy">35 - 2 = 33</p> <p>b) 18 - 3 = ?</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/542-1662103619.png.webp" width="375" height="93" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-8" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-8" loading="lazy">18 - 3 = ...</p> <p>c) 16 - 4 = ?</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/543-1662103660.png.webp" width="484" height="94" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-9" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-9" loading="lazy">16 - 4 = ...</p> <h4>2. Đ, S?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/544-1662103692.png.webp" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-10" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-10" 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>3. Hai phép tính nào có cùng kết quả?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/551-1662103710.png.webp" width="639" height="468" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-11" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-11" loading="lazy"></p> <h4>4. Có 18 bạn rùa và thỏ chơi trốn tìm, trong đó có 8 bạn rùa. Hỏi có bao nhiêu bạn thỏ.</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/552-1662103747.png.webp" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-12" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-12" loading="lazy"></p> <h3 id="luyen-tap">Luyện tập</h3> <h4>1. Đặt tính rồi tính</h4> <p>a) 53 + 4; 57 - 4</p> <p>b) 65 + 3; 68 - 3</p> <p>c) 95 + 2; 97 - 2</p> <h4>2. Số?</h4> <p>a)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/561-1662103806.png.webp" width="378" height="114" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-13" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-13" loading="lazy"></p> <p>b)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/562-1662103816.png.webp" width="376" height="117" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-14" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-14" loading="lazy"></p> <p>&nbsp;</p> <h4>3. Điều nào ghi phép tính có kết quả lớn hơn 55?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/563-1662103844.png.webp" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-15" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-15" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <h4>4. Cây dừa có 48 quả. Các bạn đã hái xuống 5 quả. Hỏi trên cây còn lại bao nhiêu quả dừa?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/571-1662103880.png.webp" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-16" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-16" loading="lazy"></p> <h3 id="trograve-choi">Trò chơi</h3> <p><strong>Lấy đồ chơi nào?</strong></p> <p>Cách chơi:</p> <ul> <li><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/572-1662103905.png.webp" width="311" height="137" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-17" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-17" loading="lazy">Chơi theo nhóm.</li> <li>Khi đến lượt, người chơi gieo xúc xắc. Đếm số chấm nhận được ở mặt trên xúc xắc. Lấy 49 trừ đi số nhận được. Lấy các đồ chơi ghi số bằng kết quả phép tính trên đó.</li> <li>Trò chơi kết thúc khi lấy được 6 đồ chơi.</li> </ul> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/573-1662103965.png.webp" alt="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-18" title="hinh-anh-bai-31-phep-tru-so-co-hai-chu-so-cho-so-co-mot-chu-so-341-18" loading="lazy"></p>