Mi-li-mét vuông. Bảng đơn vị đo diện tích
<h3 id="a-mi-li-meacutet-vuocircng">a) Mi-li-mét vuông</h3> <p>Để đo những diện tích rất bé, người ta còn dùng đơn vị <em>mi-li-mét vuông</em>.</p> <p>Mi-li-mét vuông là diện tích của hình vuông có cạnh dài 1mm. Mi-li-mét vuông viết tắt là mm<sup>2</sup>.</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/bb-1665868241.PNG.webp" width="358" height="261" alt="hinh-anh-mi-li-met-vuong-bang-don-vi-do-dien-tich-1619-0" title="hinh-anh-mi-li-met-vuong-bang-don-vi-do-dien-tich-1619-0" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div>Ta thấy hình vuông 1cm<sup>2</sup> gồm 100 hình vuông 1mm<sup>2</sup>.<p></p> <p>1cm<sup>2 </sup>= 100mm<sup>2</sup></p> <p>1mm<sup>2</sup> = <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-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c31"></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"><mfrac><mn>1</mn><mn>100</mn></mfrac></math></mjx-assistive-mml></mjx-container>cm<sup>2</sup></p> <h3 id="b-bang-don-vi-do-dien-tiacutech">b) Bảng đơn vị đo diện tích</h3> <table style="border-collapse: collapse; width: 99.9147%; height: 67.1592px;" border="1"> <tbody> <tr style="height: 22.3864px;"> <td style="width: 42.9897%; height: 22.3864px; text-align: center;" colspan="3"><strong>Lớn hơn mét vuông</strong></td> <td style="width: 14.2989%; height: 22.3864px; text-align: center;"><strong>Mét vuông</strong></td> <td style="height: 22.3864px; width: 42.7111%; text-align: center;" colspan="3"><strong>Bé hơn mét vuông</strong></td> </tr> <tr style="height: 22.3864px;"> <td style="width: 14.2989%; height: 22.3864px; text-align: center;">km<sup>2</sup></td> <td style="width: 14.2989%; height: 22.3864px; text-align: center;">hm<sup>2</sup></td> <td style="width: 14.3918%; height: 22.3864px; text-align: center;">dam<sup>2</sup></td> <td style="width: 14.2989%; height: 22.3864px; text-align: center;">m<sup>2</sup></td> <td style="width: 14.3918%; height: 22.3864px; text-align: center;">dm<sup>2</sup></td> <td style="width: 14.2989%; height: 22.3864px; text-align: center;">cm<sup>2</sup></td> <td style="width: 14.0204%; height: 22.3864px; text-align: center;">mm<sup>2</sup></td> </tr> <tr style="height: 22.3864px;"> <td style="width: 14.2989%; height: 22.3864px;"> <p>1km<sup>2</sup></p> <p>= 100hm<sup>2</sup></p> </td> <td style="width: 14.2989%; height: 22.3864px;"> <p>1hm<sup>2</sup></p> <p>= 100dam<sup>2</sup></p> <p>=&nbsp;<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-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c31"></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"><mfrac><mn>1</mn><mn>100</mn></mfrac></math></mjx-assistive-mml></mjx-container>km<sup>2</sup></p> </td> <td style="width: 14.3918%; height: 22.3864px;"> <p>1dam<sup>2</sup></p> <p>= 100m<sup>2</sup></p> <p>=&nbsp;<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-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"><mfrac><mn>1</mn><mn>100</mn></mfrac></math></mjx-assistive-mml></mjx-container>hm<sup>2</sup></p> </td> <td style="width: 14.2989%; height: 22.3864px;"> <p>1m<sup>2</sup></p> <p>= 100dm<sup>2</sup></p> <p>=&nbsp;<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-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c31"></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"><mfrac><mn>1</mn><mn>100</mn></mfrac></math></mjx-assistive-mml></mjx-container>dam<sup>2</sup></p> </td> <td style="width: 14.3918%; height: 22.3864px;"> <p>1dm<sup>2</sup></p> <p>= 100cm<sup>2</sup></p> <p>=&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-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c31"></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"><mfrac><mn>1</mn><mn>100</mn></mfrac></math></mjx-assistive-mml></mjx-container>m2</p> </td> <td style="width: 14.2989%; height: 22.3864px;"> <p>1cm<sup>2</sup></p> <p>= 100mm<sup>2</sup></p> <p>=&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-mfrac><mjx-frac><mjx-num><mjx-nstrut></mjx-nstrut><mjx-mn class="mjx-n" size="s"><mjx-c class="mjx-c31"></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"><mfrac><mn>1</mn><mn>100</mn></mfrac></math></mjx-assistive-mml></mjx-container>dm2</p> </td> <td style="width: 14.0204%; height: 22.3864px;"> <p>1mm<sup>2</sup></p> <p>=&nbsp;<mjx-container class="MathJax CtxtMenu_Attached_0" jax="CHTML" tabindex="0" ctxtmenu_counter="6" 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-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"><mfrac><mn>1</mn><mn>100</mn></mfrac></math></mjx-assistive-mml></mjx-container>cm2</p> </td> </tr> </tbody> </table> <p>Nhận xét:</p> <p>- Mỗi đơn vị đo diện tích gấp 100 lần đơn vị bé hơn tiếp liền.</p> <p>- Mỗi đơn vị đo diện tích bằng <mjx-container class="MathJax CtxtMenu_Attached_0" jax="CHTML" tabindex="0" ctxtmenu_counter="7" 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-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"><mfrac><mn>1</mn><mn>100</mn></mfrac></math></mjx-assistive-mml></mjx-container> đơn vị lớn hơn tiếp liền.</p> <h3 id="bagravei-tap">Bài tập</h3> <p><strong>1.</strong>a) Đọc các số đo diện tích: 29mm<sup>2</sup>;&nbsp; &nbsp; &nbsp; 305mm<sup>2</sup>;&nbsp; &nbsp; &nbsp;&nbsp;1200mm<sup>2</sup>.</p> <p>b) Viết các số đo diện tích:</p> <p>Một trăm sáu mươi tám mi-li-mét vuông.</p> <p>Hai nghìn ba trăm mười mi-li-mét vuông.</p> <p><strong>2.</strong>Viết số thích hợp vào chỗ chấm:</p> <p>a) 5cm<sup>2</sup> = ... mm<sup>2&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</sup>1m<sup>2</sup><span style="white-space: pre;"> </span>=... cm<sup>2</sup></p> <p>&nbsp; &nbsp;12km<sup>2</sup> =... hm<sup>2&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</sup>5m<sup>2</sup><span style="white-space: pre;"> </span>=... cm<sup>2</sup></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; 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&nbsp;1hm<sup>2 </sup>= ... m<sup>2&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</sup>12m<sup>2</sup>&nbsp;9dm<sup>2&nbsp;</sup>= ... dm<sup>2</sup></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: 0px;" data-ad-status="unfilled"><div id="aswift_4_host" tabindex="0" title="Advertisement" aria-label="Advertisement" style="border: none; height: 0px; width: 741px; margin: 0px; padding: 0px; position: relative; visibility: visible; background-color: transparent; display: inline-block; overflow: visible; opacity: 1;"><iframe id="aswift_4" name="aswift_4" style="left: 0px; position: absolute; top: 0px; border: 0px; width: 741px; height: 0px;" sandbox="allow-forms allow-popups allow-popups-to-escape-sandbox allow-same-origin allow-scripts allow-top-navigation-by-user-activation" width="741" height="0" frameborder="0" marginwidth="0" marginheight="0" vspace="0" hspace="0" allowtransparency="true" scrolling="no" src="https://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-8123786206223951&amp;output=html&amp;h=280&amp;adk=2020488560&amp;adf=39315810&amp;pi=t.aa~a.1694800419~i.46~rp.4&amp;w=741&amp;fwrn=4&amp;fwrnh=100&amp;lmt=1690918676&amp;num_ads=1&amp;rafmt=1&amp;armr=3&amp;sem=mc&amp;pwprc=7302649500&amp;ad_type=text_image&amp;format=741x280&amp;url=https%3A%2F%2Fsachgiaokhoa.online%2Fmi-li-met-vuong-bang-don-vi-do-dien-tich-1619G2942.html&amp;fwr=0&amp;pra=3&amp;rh=186&amp;rw=741&amp;rpe=1&amp;resp_fmts=3&amp;wgl=1&amp;fa=27&amp;uach=WyJtYWNPUyIsIjEzLjAuMCIsIng4NiIsIiIsIjExNS4wLjU3OTAuMTE0IixbXSwwLG51bGwsIjY0IixbWyJOb3QvQSlCcmFuZCIsIjk5LjAuMC4wIl0sWyJHb29nbGUgQ2hyb21lIiwiMTE1LjAuNTc5MC4xMTQiXSxbIkNocm9taXVtIiwiMTE1LjAuNTc5MC4xMTQiXV0sMF0.&amp;dt=1690918676910&amp;bpp=2&amp;bdt=1197&amp;idt=2&amp;shv=r20230727&amp;mjsv=m202307270401&amp;ptt=9&amp;saldr=aa&amp;abxe=1&amp;cookie=ID%3D94547395a8fa18af-22e89ad22ae300c0%3AT%3D1690912062%3ART%3D1690918437%3AS%3DALNI_MYNbCG599XmevrUPCYJ3Zv-Np5EvA&amp;gpic=UID%3D00000d3b2ce8a729%3AT%3D1690912062%3ART%3D1690918437%3AS%3DALNI_MaVlHrwAJeI0KGbMoTcFZDk5BwO2Q&amp;prev_fmts=0x0%2C741x280%2C741x280%2C741x280&amp;nras=3&amp;correlator=4721369105324&amp;frm=20&amp;pv=1&amp;ga_vid=112831303.1690918676&amp;ga_sid=1690918676&amp;ga_hid=1166517014&amp;ga_fc=0&amp;u_tz=420&amp;u_his=50&amp;u_h=1080&amp;u_w=1920&amp;u_ah=1055&amp;u_aw=1920&amp;u_cd=24&amp;u_sd=1&amp;dmc=8&amp;adx=394&amp;ady=2475&amp;biw=1910&amp;bih=970&amp;scr_x=0&amp;scr_y=0&amp;eid=44759876%2C44759927%2C44759842%2C31071258%2C31076481%2C31076484%2C31076510%2C31076578%2C42531705%2C44788441%2C44798156&amp;oid=2&amp;pvsid=3194060359482149&amp;tmod=133538902&amp;uas=0&amp;nvt=1&amp;fc=1408&amp;brdim=0%2C25%2C0%2C25%2C1920%2C25%2C1920%2C1055%2C1920%2C970&amp;vis=1&amp;rsz=%7C%7Cs%7C&amp;abl=NS&amp;fu=128&amp;bc=31&amp;ifi=5&amp;uci=a!5&amp;btvi=3&amp;fsb=1&amp;xpc=zDqIomSVV5&amp;p=https%3A//sachgiaokhoa.online&amp;dtd=17" data-google-container-id="a!5" data-google-query-id="CNGk4PiavIADFUPDfAodaiIKNw" data-load-complete="true"></iframe></div></ins></div> <p>&nbsp; &nbsp;7hm<sup>2</sup> = ... m<sup>2&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</sup>37dam<sup>2&nbsp;</sup>24m<sup>2</sup>&nbsp;=... m<sup>2</sup></p> <p>b) 800mm<sup>2 </sup>= ... cm<sup>2&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</sup>3400dm<sup>2</sup>&nbsp;=... m<sup>2</sup></p> <p>12 000hm<sup>2</sup> = ... km<sup>2&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</sup>90 000m<sup>2</sup>&nbsp;= ... hm<sup>2</sup></p> <p>150cm<sup>2</sup><span style="white-space: pre;"> </span>= ... dm<sup>2</sup>... cm<sup>2&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </sup>2010m<sup>2</sup>&nbsp;= ... dam<sup>2</sup>... m<sup>2</sup></p> <p><strong>3.</strong>Viết phân số thích hợp vào chỗ chấm:</p> <p>1mm<sup>2</sup>&nbsp;= ... cm<sup>2</sup><span style="font-size: 13.3333px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</span>1dm<sup>2</sup>&nbsp;=... m<sup>2</sup></p> <p>8mm<sup>2</sup>&nbsp;=... cm<sup>2&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; </sup>7dm<sup>2</sup>&nbsp;=... m<sup>2</sup></p> <p>29mm<sup>2</sup>&nbsp;=... cm<sup>2&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</sup>34dm<sup>2</sup> =... m<sup>2</sup></p>