Em ôn lại những gì đã học
<h3 id="1-tiacutenh-nham">1. Tính nhẩm:</h3> <p>2x6 ; 6x2 ; 12:2 ; 12:6</p> <p>7x4 ; 4x7 ; 28:7 ; 28:4</p> <p>9x3 ; 3x9 ; 27:9 ; 27:3</p> <p>8x5 ; 5x8 ; 40:8 ; 40:5</p> <h3 id="2-chon-the-tuong-ung-voi-phan-datilde-tocirc-magraveu-trong-moi-higravenh-sau">2. Chọn thẻ tương ứng với phần đã tô màu trong mỗi hình sau:</h3> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b29-h1-1664531335.jpg.webp" width="711" height="319" alt="hinh-anh-em-on-lai-nhung-gi-da-hoc-1014-0" title="hinh-anh-em-on-lai-nhung-gi-da-hoc-1014-0" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
<span class="ads-title">Advertisement</span>
<script async="" src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-8123786206223951" crossorigin="anonymous" type="text/javascript" data-checked-head="true"></script>

<ins class="adsbygoogle" style="display: block; height: 280px;" data-ad-client="ca-pub-8123786206223951" data-ad-slot="2203391893" data-ad-format="auto" data-full-width-responsive="true" data-adsbygoogle-status="done"><div id="aswift_1_host" style="border: none; height: 280px; width: 741px; margin: 0px; padding: 0px; position: relative; visibility: visible; background-color: transparent; display: inline-block;"></div></ins>
<script type="text/javascript">
            (adsbygoogle = window.adsbygoogle || []).push({});
        </script>
</div>
</div><p></p> <h3 id="3-chon-dau-x-thiacutech-hop">3. Chọn dấu (+, -, x, :) thích hợp:</h3> <p>8 (?) 1 = 9&nbsp; ;&nbsp; 6 (?) 3 = 2&nbsp; ;&nbsp; 1 (?) 9 = 9</p> <p>7 (?) 7 = 1&nbsp; ;&nbsp; 0 (?) 3 = 3&nbsp; ;&nbsp; 5 (?) 0 = 0</p> <p>1 (?) 4 = 4&nbsp; ;&nbsp; 1 (?) 1 = 0&nbsp; ;&nbsp; 1 (?) 0 = 1</p> <p>6 (?) 0 = 0&nbsp; ;&nbsp; 0 (?) 6 = 6&nbsp; ;&nbsp; 8 (?) 8 = 1</p> <h3 id="4-so">4. Số ?</h3> <table style="border-collapse: collapse; width: 59.9784%; height: 192px;" border="1"> <tbody> <tr style="height: 23.2176px;"> <td style="width: 63.699%; height: 23.2176px;">Số đã cho</td> <td style="width: 12.5571%; height: 23.2176px; text-align: center;">6</td> <td style="width: 12.3288%; height: 23.2176px; text-align: center;">3</td> <td style="width: 11.4156%; height: 23.2176px; text-align: center;">9</td> </tr> <tr style="height: 23.2176px;"> <td style="width: 63.699%; height: 23.2176px;">Thêm 3 đơn vị</td> <td style="width: 12.5571%; height: 23.2176px; text-align: center;">9</td> <td style="width: 12.3288%; height: 23.2176px; text-align: center;">?</td> <td style="width: 11.4156%; height: 23.2176px; text-align: center;">?</td> </tr> <tr style="height: 23.2176px;"> <td style="width: 63.699%; height: 23.2176px;">Gấp 3 lần</td> <td style="width: 12.5571%; height: 23.2176px; text-align: center;">18</td> <td style="width: 12.3288%; height: 23.2176px; text-align: center;">?</td> <td style="width: 11.4156%; height: 23.2176px; text-align: center;">?</td> </tr> <tr style="height: 23.2176px;"> <td style="width: 63.699%; height: 23.2176px;">Bớt 3 đơn vị</td> <td style="width: 12.5571%; height: 23.2176px; text-align: center;">3</td> <td style="width: 12.3288%; height: 23.2176px; text-align: center;">?</td> <td style="width: 11.4156%; height: 23.2176px; text-align: center;">?</td> </tr> <tr style="height: 23.2639px;"> <td style="width: 63.699%; height: 23.2639px;">Giảm 3 lần</td> <td style="width: 12.5571%; height: 23.2639px; text-align: center;">2</td> <td style="width: 12.3288%; height: 23.2639px; text-align: center;">?</td> <td style="width: 11.4156%; height: 23.2639px; text-align: center;">?</td> </tr> </tbody> </table> <h3 id="5">5.</h3> <p>Chú Nam vắt được 5 xô sữa bò, mỗi xô có 8<em>l&nbsp;</em>sữa. Hỏi chú Nam vắt được tất cả bao nhiêu lít sữa bò?</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b29-h2-1664531903.jpg.webp" width="678" height="280" alt="hinh-anh-em-on-lai-nhung-gi-da-hoc-1014-1" title="hinh-anh-em-on-lai-nhung-gi-da-hoc-1014-1" loading="lazy"></p> <h3 id="6-uoc-luong-roi-necircu-cacircn-nang-phugrave-hop-voi-moi-truong-hop-sau">6. Ước lượng rồi nêu cân nặng phù hợp với mỗi trường hợp sau:</h3> <p>a)</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b29-h3-1664532087.jpg.webp" width="496" height="367" alt="hinh-anh-em-on-lai-nhung-gi-da-hoc-1014-2" title="hinh-anh-em-on-lai-nhung-gi-da-hoc-1014-2" loading="lazy"></p> <p>b)&nbsp;</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b29-h4-1664532137.jpg.webp" width="459" height="366" alt="hinh-anh-em-on-lai-nhung-gi-da-hoc-1014-3" title="hinh-anh-em-on-lai-nhung-gi-da-hoc-1014-3" loading="lazy"></p>