Xăng-ti-mét. Đơn Vị Đo Độ Dài
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</div>xăng-ti-mét viết tắt là cm<p></p> <p>1 cm đọc là một xăng-ti-mét</p> <h3 id="thuc-hagravenh-1-tap-viet">Thực hành 1. Tập viết.</h3> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1402-1663565165.png.webp" alt="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-1" title="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-1" loading="lazy"></p> <h3 id="thuc-hagravenh-2-do-doc-so-do">Thực hành 2. Đo, đọc số đo.</h3> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1403-1663565192.png.webp" width="712" height="355" alt="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-2" title="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-2" loading="lazy"></p> <h3 id="luyen-tap-1-uoc-luong-roi-do-do-dagravei-caacutec-do-vat">Luyện tập 1. Ước lượng rồi đo độ dài các đồ vật.</h3> <table style="border-collapse: collapse; width: 99.9265%; height: auto !important;" border="1"> <tbody> <tr> <td style="width: 30.2382%;">&nbsp;</td> <td style="width: 30.2382%; text-align: center;">ước lượng</td> <td style="width: 30.2428%; text-align: center;">đo</td> </tr> <tr> <td style="width: 30.2382%;"><img src="/uploads/tinymce/1411-1663565251.png.webp" width="56" height="50" alt="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-3" title="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-3" loading="lazy"></td> <td style="width: 30.2382%; text-align: center;">khoảng ..?.. cm</td> <td style="width: 30.2428%; text-align: center;">..?.. cm</td> </tr> <tr> <td style="width: 30.2382%;"><img src="/uploads/tinymce/1412-1663565262.png.webp" width="76" height="49" alt="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-4" title="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-4" loading="lazy"></td> <td style="width: 30.2382%; text-align: center;">khoảng ..?.. cm</td> <td style="width: 30.2428%; text-align: center;">..?.. cm</td> </tr> <tr style="height: auto !important;"> <td style="width: 30.2382%; height: auto !important;"><img src="/uploads/tinymce/1413-1663565273.png.webp" width="119" height="69" alt="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-5" title="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-5" loading="lazy"><div> <div class="ads-horizontal-wrapped">
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</div></td> <td style="width: 30.2382%; text-align: center;">khoảng ..?.. cm</td> <td style="width: 30.2428%; text-align: center;">..?.. cm</td> </tr> <tr> <td style="width: 30.2382%;"><img src="/uploads/tinymce/1414-1663565285.png.webp" width="205" height="83" alt="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-6" title="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-6" loading="lazy"></td> <td style="width: 30.2382%; text-align: center;">khoảng ..?.. cm</td> <td style="width: 30.2428%; text-align: center;">..?.. cm</td> </tr> <tr> <td style="width: 30.2382%;"><img src="/uploads/tinymce/1415-1663565304.png.webp" width="302" height="186" alt="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-7" title="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-7" loading="lazy"></td> <td style="width: 30.2382%; text-align: center;">khoảng ..?.. cm</td> <td style="width: 30.2428%; text-align: center;">..?.. cm</td> </tr> </tbody> </table> <h3 id="luyen-tap-2-dugraveng-thuoc-thang-do-bagraven-tay-cua-em-noacutei-so-do">Luyện tập 2. Dùng thước thẳng đo bàn tay của em, nói số đo.</h3> <p style="text-align: center;"><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1421-1663565362.png.webp" alt="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-8" title="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-8" loading="lazy">Ngón trỏ dài ...?... cm.</p> <p style="text-align: center;">Bàn tay dài ...?... cm.</p> <p style="text-align: center;"><img src="/uploads/tinymce/1422-1663565404.png.webp" width="349" height="268" alt="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-9" title="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-9" loading="lazy"></p> <p style="text-align: center;">Gang tay dài ...?... cm.</p> <h3 style="text-align: left;" id="luyen-tap-3-em-xep-saacutech-vagraveo-ngan-cho-phugrave-hop">Luyện tập 3. Em xếp sách vào ngăn cho phù hợp.</h3> <p style="text-align: left;"><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1423-1663565436.png.webp" alt="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-10" title="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-10" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div><p></p> <h3 style="text-align: left;" id="luyen-tap-4-tiep-theo-lagrave-higravenh-nagraveo">Luyện tập 4. Tiếp theo là hình nào?</h3> <p style="text-align: left;"><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1431-1663565461.png.webp" width="262" height="133" alt="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-11" title="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-11" loading="lazy"></p> <h4 style="text-align: left;">Vui học</h4> <p style="text-align: left;">An cắt một băng giấy thành ba mảnh.</p> <p style="text-align: left;">Dựa vào hình vẽ, làm sao để biết, khi chưa cắt băng giấy dài bao nhiêu xăng-ti-mét?</p> <p style="text-align: left;"><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1432-1663565507.png.webp" width="724" height="194" alt="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-12" title="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-12" loading="lazy">Dùng thước thẳng đo liên tiếp ba mảnh giấy trên.</p> <p style="text-align: left;"><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1433-1663565534.png.webp" width="744" height="196" alt="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-13" title="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-13" loading="lazy">Khi chưa cắt, băng giấy dài ? cm.</p> <h4 style="text-align: left;">Hoạt động thực tế</h4> <p style="text-align: left;">Em tập làm một vòng cổ động bằng bìa.</p> <p style="text-align: left;"><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/1434-1663565572.png.webp" alt="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-14" title="hinh-anh-xang-ti-met-don-vi-do-do-dai-758-14" loading="lazy"></p>