Luyện tập 3
<h3 id="1-tiacutenh">1. Tính:</h3> <p>a) <img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/anh-chup-man-hinh-2022-10-09-181154-1665313980.png.webp" width="531" height="88" alt="hinh-anh-luyen-tap-3-1488-0" title="hinh-anh-luyen-tap-3-1488-0" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div><p></p> <p>b) <img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/anh-chup-man-hinh-2022-10-09-181336-1665314030.png.webp" width="531" height="91" alt="hinh-anh-luyen-tap-3-1488-1" title="hinh-anh-luyen-tap-3-1488-1" loading="lazy"></p> <h3 id="2-dat-tiacutenh-roi-tiacutenh">2. Đặt tính rồi tính:</h3> <p>a) 174 + 625; 607 + 82; 281 + 8</p> <p>b) 487 - 234; 596 - 95; 724 - 4</p> <h3 id="3nbsp">3.&nbsp;</h3> <p>a) Tính nhẩm (theo mẫu):</p> <p><strong>Mẫu: 500 + 300 = 800; 1000-400= 600</strong></p> <p>200+400</p> <p>700+300</p> <p>500+500</p> <p>600+100</p> <p>1000-200</p> <p>1000-900</p> <p>300+60+7</p> <p>900+90+9</p> <p>700+20+5</p> <p>b) Trò chơi ''Tìm bạn cũng qua cầu''</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/anh-chup-man-hinh-2022-10-09-181948-1665314399.png.webp" width="583" height="270" alt="hinh-anh-luyen-tap-3-1488-2" title="hinh-anh-luyen-tap-3-1488-2" loading="lazy"></p> <h3 id="4-viet-so-thagravenh-tong-caacutec-tram-chuc-don-vi-theo-mau">4. Viết số thành tổng các trăm, chục, đơn vị (theo mẫu):</h3> <p><strong>Mẫu:</strong> 415 gồm 4 trăm 1 chục 5 đơn vị, ta biết 415 = 400 + 10 + 5</p> <p>820 gồm 8 trăm 2 chục 0 đơn vị, ta viết 820 = 800 + 20</p><div class="google-auto-placed ap_container" style="width: 100%; height: auto; clear: both; text-align: center;"><ins data-ad-format="auto" class="adsbygoogle adsbygoogle-noablate" data-ad-client="ca-pub-8123786206223951" data-adsbygoogle-status="done" style="display: block; margin: auto; background-color: transparent; height: 280px;"><div id="aswift_4_host" style="border: none; height: 280px; width: 741px; margin: 0px; padding: 0px; position: relative; visibility: visible; background-color: transparent; display: inline-block;"></div></ins></div> <p>709 gồm 7 trăm 0 chục 9 đơn vị, ta viết 709 = 700 + 9</p> <p>a) 683</p> <p>b) 127</p> <p>c) 303</p> <p>d) 240</p> <h3 id="5-thuc-hien-pheacutep-tru-roi-kiem-tra-lai-ket-qua-bang-pheacutep-cong">5. Thực hiện phép trừ rồi kiểm tra lại kết quả bằng phép cộng:</h3> <p>a)</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/anh-chup-man-hinh-2022-10-09-182753-1665314899.png.webp" width="205" height="106" alt="hinh-anh-luyen-tap-3-1488-3" title="hinh-anh-luyen-tap-3-1488-3" loading="lazy"></p> <p>b)&nbsp;</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/anh-chup-man-hinh-2022-10-09-182850-1665314973.png.webp" width="189" height="104" alt="hinh-anh-luyen-tap-3-1488-4" title="hinh-anh-luyen-tap-3-1488-4" loading="lazy"></p> <h3 id="6">6.</h3> <p>Hưởng ứng phong trào ''Trồng cây gây rừng'', xã Thắng Lợi đã trồng được 345 cây bạch đàn và 420 cây keo tai tượng. Hỏi xã Thắng đã Thắng Lợi đã trồng được tất cả bao nhiêu cây bạch đàn và cây keo tai tượng?</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/anh-chup-man-hinh-2022-10-09-183311-1665315206.png.webp" width="533" height="291" alt="hinh-anh-luyen-tap-3-1488-5" title="hinh-anh-luyen-tap-3-1488-5" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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