Khái niệm số thập phân (tiếp theo)
<table style="border-collapse: collapse; width: 99.9147%;" border="1"> <tbody> <tr> <td style="width: 23.7195%; text-align: center;">m</td> <td style="width: 23.7195%; text-align: center;">dm</td> <td style="width: 23.7195%; text-align: center;">cm</td> <td style="width: 23.7221%; text-align: center;">mm</td> </tr> <tr> <td style="width: 23.7195%; text-align: center;">2</td> <td style="width: 23.7195%; text-align: center;">7</td> <td style="width: 23.7195%; text-align: center;">&nbsp;</td> <td style="width: 23.7221%; text-align: center;">&nbsp;</td> </tr> <tr> <td style="width: 23.7195%; text-align: center;">8</td> <td style="width: 23.7195%; text-align: center;">5</td> <td style="width: 23.7195%; text-align: center;">6</td> <td style="width: 23.7221%; text-align: center;">&nbsp;</td> </tr> <tr> <td style="width: 23.7195%; text-align: center;">0</td> <td style="width: 23.7195%; text-align: center;">1</td> <td style="width: 23.7195%; text-align: center;">9</td> <td style="width: 23.7221%; text-align: center;">5</td> </tr> </tbody> </table> <p>2m 7dm hay <mjx-container class="MathJax CtxtMenu_Attached_0" jax="CHTML" tabindex="0" ctxtmenu_counter="0" style="font-size: 116.7%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c32"></mjx-c></mjx-mn><mjx-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c37"></mjx-c></mjx-mn></mjx-num><mjx-dbox><mjx-dtable><mjx-line></mjx-line><mjx-row><mjx-den><mjx-dstrut></mjx-dstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c31"></mjx-c><mjx-c class="mjx-c30"></mjx-c></mjx-mn></mjx-den></mjx-row></mjx-dtable></mjx-dbox></mjx-frac></mjx-mfrac></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>2</mn><mfrac><mn>7</mn><mn>10</mn></mfrac></math></mjx-assistive-mml></mjx-container>m được viết thành 2,7m;</p> <p>2,7m đọc là: hai phẩy bảy mét.</p> <p>8m 56cm hay <mjx-container class="MathJax CtxtMenu_Attached_0" jax="CHTML" tabindex="0" ctxtmenu_counter="1" style="font-size: 116.7%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c38"></mjx-c></mjx-mn><mjx-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c35"></mjx-c><mjx-c class="mjx-c36"></mjx-c></mjx-mn></mjx-num><mjx-dbox><mjx-dtable><mjx-line></mjx-line><mjx-row><mjx-den><mjx-dstrut></mjx-dstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c31"></mjx-c><mjx-c class="mjx-c30"></mjx-c><mjx-c class="mjx-c30"></mjx-c></mjx-mn></mjx-den></mjx-row></mjx-dtable></mjx-dbox></mjx-frac></mjx-mfrac></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>8</mn><mfrac><mn>56</mn><mn>100</mn></mfrac></math></mjx-assistive-mml></mjx-container>m được viết thành 8,56m;</p> <p>8,56m đọc là: tám phẩy năm mươi sáu mét.</p> <p>• 0m 195mm hay 0m và <mjx-container class="MathJax CtxtMenu_Attached_0" jax="CHTML" tabindex="0" ctxtmenu_counter="2" style="font-size: 116.7%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c31"></mjx-c><mjx-c class="mjx-c39"></mjx-c><mjx-c class="mjx-c35"></mjx-c></mjx-mn></mjx-num><mjx-dbox><mjx-dtable><mjx-line></mjx-line><mjx-row><mjx-den><mjx-dstrut></mjx-dstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c31"></mjx-c><mjx-c class="mjx-c30"></mjx-c><mjx-c class="mjx-c30"></mjx-c><mjx-c class="mjx-c30"></mjx-c></mjx-mn></mjx-den></mjx-row></mjx-dtable></mjx-dbox></mjx-frac></mjx-mfrac></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>195</mn><mn>1000</mn></mfrac></math></mjx-assistive-mml></mjx-container>m được viết thành 0,195m;</p> <p>0,195m đọc là: không phẩy một trăm chín mươi lăm mét.</p> <p>Các số: 2,7; 8,56; 0,195 cũng là số thập phân.</p> <p>Mỗi số thập phân gồm hai phần: phần nguyên và phần thập phân, chúng được phân cách bởi dấu phẩy.</p> <p>Những chữ số ở bên trái dấu phẩy thuộc về phần nguyên, những chữ số ở bên phải dấu phẩy thuộc về phần thập phân.</p> <p style="text-align: center;"><img src="/uploads/tinymce/c21c-1666106930.PNG.webp" alt="hinh-anh-khai-niem-so-thap-phan-tiep-theo-1698-0" title="hinh-anh-khai-niem-so-thap-phan-tiep-theo-1698-0" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div><p></p> <h3 id="bagravei-tap">Bài tập</h3> <h4>1.Đọc mỗi số thập phân sau:</h4> <p>9,4;&nbsp; &nbsp; &nbsp; 7,98;&nbsp; &nbsp; &nbsp; 25,477;&nbsp; &nbsp; &nbsp; 206,075;&nbsp; &nbsp; &nbsp; 0,307.</p> <h4>2.Viết các hỗn số sau thành số thập phân rồi đọc số đó:</h4> <p><mjx-container class="MathJax CtxtMenu_Attached_0" jax="CHTML" tabindex="0" ctxtmenu_counter="3" style="font-size: 116.7%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c35"></mjx-c></mjx-mn><mjx-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c39"></mjx-c></mjx-mn></mjx-num><mjx-dbox><mjx-dtable><mjx-line></mjx-line><mjx-row><mjx-den><mjx-dstrut></mjx-dstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c31"></mjx-c><mjx-c class="mjx-c30"></mjx-c></mjx-mn></mjx-den></mjx-row></mjx-dtable></mjx-dbox></mjx-frac></mjx-mfrac></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>5</mn><mfrac><mn>9</mn><mn>10</mn></mfrac></math></mjx-assistive-mml></mjx-container>;&nbsp; &nbsp; &nbsp; <mjx-container class="MathJax CtxtMenu_Attached_0" jax="CHTML" tabindex="0" ctxtmenu_counter="4" style="font-size: 116.7%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c38"></mjx-c><mjx-c class="mjx-c32"></mjx-c></mjx-mn><mjx-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c34"></mjx-c><mjx-c class="mjx-c35"></mjx-c></mjx-mn></mjx-num><mjx-dbox><mjx-dtable><mjx-line></mjx-line><mjx-row><mjx-den><mjx-dstrut></mjx-dstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c31"></mjx-c><mjx-c class="mjx-c30"></mjx-c><mjx-c class="mjx-c30"></mjx-c></mjx-mn></mjx-den></mjx-row></mjx-dtable></mjx-dbox></mjx-frac></mjx-mfrac></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>82</mn><mfrac><mn>45</mn><mn>100</mn></mfrac></math></mjx-assistive-mml></mjx-container>;&nbsp; &nbsp; &nbsp; <mjx-container class="MathJax CtxtMenu_Attached_0" jax="CHTML" tabindex="0" ctxtmenu_counter="5" style="font-size: 116.7%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c38"></mjx-c><mjx-c class="mjx-c31"></mjx-c><mjx-c class="mjx-c30"></mjx-c></mjx-mn><mjx-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c32"></mjx-c><mjx-c class="mjx-c32"></mjx-c><mjx-c class="mjx-c35"></mjx-c></mjx-mn></mjx-num><mjx-dbox><mjx-dtable><mjx-line></mjx-line><mjx-row><mjx-den><mjx-dstrut></mjx-dstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c31"></mjx-c><mjx-c class="mjx-c30"></mjx-c><mjx-c class="mjx-c30"></mjx-c><mjx-c class="mjx-c30"></mjx-c></mjx-mn></mjx-den></mjx-row></mjx-dtable></mjx-dbox></mjx-frac></mjx-mfrac></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>810</mn><mfrac><mn>225</mn><mn>1000</mn></mfrac></math></mjx-assistive-mml></mjx-container>.</p> <h4>3.Các số thập phân sau thành phân số thập phân:</h4> <p>0,1;&nbsp; &nbsp; &nbsp;&nbsp;0,02;&nbsp; &nbsp; &nbsp; 0,004;&nbsp; &nbsp; &nbsp;&nbsp;0,095.</p>