Đơn vị đo diện tích. Xăng-ti-mét vuông
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</div><p></p> <ul> <li>Để đo diện tích ta dùng đơn vị đo diện tích, chẳng hạn: xăng-ti-mét vuông.</li> <li>Xăng-ti-mét vuông là diện tích của hình vuông có cạnh dài 1 cm.</li> <li>Xăng-ti-mét vuông viết tắt là cm².</li> </ul> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b36-h2-1665895069.jpg.webp" width="276" height="241" alt="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-1" title="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-1" loading="lazy"></p> <p>Ví dụ:</p> <p style="text-align: center;"><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b36-h3-1665895130.jpg.webp" width="198" height="219" alt="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-2" title="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-2" loading="lazy"><br><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b36-h4-1665895161.jpg.webp" width="263" height="221" alt="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-3" title="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-3" loading="lazy"></p> <p>Hình A gồm 4 ô vuông 1 cm². Diện tích hình A bằng 4 cm².</p> <p>Hình B gồm 5 ô vuông 1 cm². Diện tích hình B bằng 5 cm².</p> <h3 id="1-so">1. Số ?</h3> <p style="text-align: center;"><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b36-h5-1665895370.jpg.webp" width="373" height="238" alt="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-4" title="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-4" loading="lazy"></p> <p style="text-align: center;">Hình B gồm ? ô vuông 1 cm².</p> <p style="text-align: center;">Diện tích hình B bằng ? cm².</p> <p style="text-align: center;"><img src="/uploads/tinymce/b36-h6-1665895437.jpg.webp" width="372" height="309" alt="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-5" title="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-5" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <p style="text-align: center;">Hình C gồm ? ô vuông 1 cm².</p> <p style="text-align: center;">Diện tích hình C bằng ? cm².</p> <h3 id="2-tiacutenh-theo-mau">2. Tính (theo mẫu):</h3> <p style="text-align: center;"><strong>Mẫu:&nbsp;</strong>10 cm² + 5 cm² = 15 cm²<br>7 cm² x 6 = 42 cm²</p> <p>8 cm² + 5 cm²</p> <p>37 cm² - 20 cm²</p> <p>9 cm² x 3</p> <p>36 cm² : 4</p> <h3 id="3-so">3. Số ?</h3> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b36-h7-1665897754.jpg.webp" width="585" height="250" alt="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-6" title="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-6" loading="lazy"></p> <h3 id="4-theo-em-ban-nagraveo-noacutei-duacuteng">4. Theo em, bạn nào nói đúng?</h3> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b36-h8-1665897807.jpg.webp" width="253" height="204" alt="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-7" title="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-7" loading="lazy"></p> <p>Khang: Hình A gồm 6 ô vuông bằng nhau, hình B gồm 24 ô vuông bằng nhau. Vậy diện tích hình A bé hơn diện tích hình B.</p> <p>Hiền: 1 ô vuông lớn bằng 4 ô vuông nhỏ. Vậy diện tích hình A bằng hình B.</p> <h3 id="5-thuc-hagravenh">5. Thực hành:</h3> <p>Sử dụng lưới ô vuông (mỗi ô là 1 cm²) để đo diện tích một số đồ vật (nhãn vở, bề mặt hộp bút, một số dụng cụ trong bộ đồ dùng học Toán như hình vuông, hình chữ nhật,...).</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b36-h9-1665898117.jpg.webp" width="632" height="365" alt="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-8" title="hinh-anh-don-vi-do-dien-tich-xang-ti-met-vuong-1629-8" loading="lazy"></p>