Các Số Đến 40
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</div><p></p> <h3 id="thuc-hagravenh-1-lagravem-theo-mau">Thực hành 1. Làm theo mẫu.</h3> <p style="text-align: center;"><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1042-1663506284.png.webp" width="151" height="244" alt="hinh-anh-cac-so-den-40-736-1" title="hinh-anh-cac-so-den-40-736-1" loading="lazy">hai mươi lăm</p> <p style="text-align: center;"><img src="/uploads/tinymce/1043-1663506301.png.webp" width="196" height="180" alt="hinh-anh-cac-so-den-40-736-2" title="hinh-anh-cac-so-den-40-736-2" loading="lazy"></p> <p style="text-align: center;"><strong>25 </strong>gồm <strong>2 </strong>chục và <strong>5 </strong>đơn vị.</p> <p style="text-align: center;">Gộp <strong>2 </strong>chục và <strong>5 </strong>đơn vị được <strong>25</strong>.</p> <h3 style="text-align: left;" id="thuc-hagravenh-2-doc-vagrave-viet-so">Thực hành 2. Đọc và viết số.</h3> <table style="border-collapse: collapse; width: 99.9265%;" border="1"> <tbody> <tr> <td style="width: 19.9115%; text-align: center;"> <p>21</p> <p>hai mươi mốt</p> </td> <td style="width: 19.9115%; text-align: center;"> <p>22</p> <p>hai mươi hai</p> </td> <td style="width: 19.9115%; text-align: center;"> <p>23</p> <p>hai mươi ba</p> </td> <td style="width: 19.9115%; text-align: center;"> <p>24</p> <p>hai mươi tư<br>hai mươi bốn</p> </td> <td style="width: 19.9115%; text-align: center;"> <p>25</p> <p>hai mươi lăm</p> </td> </tr> <tr> <td style="width: 19.9115%; text-align: center;"> <p>26</p> <p>hai mươi sáu</p> </td> <td style="width: 19.9115%; text-align: center;"> <p>27</p> <p>hai mươi bảy</p> </td> <td style="width: 19.9115%; text-align: center;"> <p>28</p> <p>hai mươi tám</p> </td> <td style="width: 19.9115%; text-align: center;"> <p>29</p> <p>hai mươi chín</p> </td> <td style="width: 19.9115%; text-align: center;"> <p>30</p> <p>ba mươi</p> </td> </tr> <tr> <td style="width: 19.9115%; text-align: center;"> <p>31</p> <p>............</p> </td> <td style="width: 19.9115%; text-align: center;"> <p>32</p> <p>ba mươi hai</p> </td> <td style="width: 19.9115%; text-align: center;"> <p>33</p> <p>ba mươi ba</p> </td> <td style="width: 19.9115%; text-align: center;">............<br>ba mươi tư<br>ba mươi bốn</td> <td style="width: 19.9115%; text-align: center;"> <p>35</p> <p>ba mươi lăm</p> </td> </tr> <tr> <td style="width: 19.9115%; text-align: center;">............<br>ba mươi sáu</td> <td style="width: 19.9115%; text-align: center;"> <p>37</p> <p>............</p> </td> <td style="width: 19.9115%; text-align: center;"> <p>38</p> <p>............</p> </td> <td style="width: 19.9115%; text-align: center;">............<br>ba mươi chín</td> <td style="width: 19.9115%; text-align: center;"> <p>40</p> <p>............</p> </td> </tr> </tbody> </table> <h3 id="luyen-tap-1-lagravem-theo-mau">Luyện tập 1. Làm theo mẫu.</h3> <p>Mẫu:<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1051-1663506571.png.webp" alt="hinh-anh-cac-so-den-40-736-3" title="hinh-anh-cac-so-den-40-736-3" loading="lazy"></p> <p>a.<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1052-1663506589.png.webp" width="222" height="480" alt="hinh-anh-cac-so-den-40-736-4" title="hinh-anh-cac-so-den-40-736-4" loading="lazy"></p> <p>b.<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1053-1663506603.png.webp" width="214" height="478" alt="hinh-anh-cac-so-den-40-736-5" title="hinh-anh-cac-so-den-40-736-5" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div><p></p> <h3 id="luyen-tap-2-so">Luyện tập 2. Số?</h3> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1054-1663506625.png.webp" width="685" height="391" alt="hinh-anh-cac-so-den-40-736-6" title="hinh-anh-cac-so-den-40-736-6" loading="lazy"></p> <h3 id="luyen-tap-3-tiacutenh">Luyện tập 3. Tính</h3> <p>30 + 6&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 27 - 7&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 16 + 3</p> <p>36 - 6&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;30 + 9&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 80 - 50</p> <h3 id="luyen-tap-4-so">Luyện tập 4. Số?</h3> <p>a.<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1061-1663506690.png.webp" alt="hinh-anh-cac-so-den-40-736-7" title="hinh-anh-cac-so-den-40-736-7" loading="lazy"></p> <p>b.<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1062-1663506702.png.webp" alt="hinh-anh-cac-so-den-40-736-8" title="hinh-anh-cac-so-den-40-736-8" loading="lazy"></p> <p>&nbsp;</p>