{"id":94282,"date":"2017-01-11T12:28:09","date_gmt":"2017-01-11T14:28:09","guid":{"rendered":"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/?p=94282"},"modified":"2026-05-27T19:14:08","modified_gmt":"2026-05-27T21:14:08","slug":"numeracao-decimal","status":"publish","type":"post","link":"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/matematica\/numeracao-decimal","title":{"rendered":"Numera\u00e7\u00e3o decimal"},"content":{"rendered":"<p>O\u00a0<b>sistema decimal<\/b>, \u00a0\u00e9 um sistema de numera\u00e7\u00e3o posicional, onde os valores s\u00e3o representados usando como base aritm\u00e9tica os poderes de n\u00famero dez .<\/p>\n<p><b>O conjunto de s\u00edmbolos utilizado (sistema de numera\u00e7\u00e3o \u00e1rabe) consiste em dez figuras:<\/b>\u00a0a zero (0) \u2013 uma (1) \u2013 dois (2) \u2013 de tr\u00eas (3) \u2013 quatro (4) \u2013 cinco (5) \u2013 seis (6 ) \u2013 sete (7) \u2013 oito (8) e nove (9).<\/p>\n<p>Salvo em certas culturas, o sistema \u00e9 comumente utilizado em todo o mundo e em todas as \u00e1reas que requerem um sistema de numera\u00e7\u00e3o. No entanto, existem certas t\u00e9cnicas, tais como em computadores, onde os sistemas de numera\u00e7\u00e3o adaptados para o m\u00e9todo usado bin\u00e1rio ou hexadecimal . Existem outros sistemas de numera\u00e7\u00e3o, tais como a romana, a qual \u00e9 decimal mas n\u00e3o posicional.<\/p>\n<p>A figura nos mostra um paralelep\u00edpedo com suas principais dimens\u00f5es em cent\u00edmetros.<\/p>\n<p class=\"imagem\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-94293\" src=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_725-Jan.-11-12.19.jpg\" alt=\"Numera\u00e7\u00e3o decimal\" width=\"183\" height=\"169\" \/><\/p>\n<p>Essas dimens\u00f5es s\u00e3o apresentadas sob a forma de nota\u00e7\u00e3o decimal, que corresponde a uma outra forma de representa\u00e7\u00e3o dos n\u00fameros racionais fracion\u00e1rios.<\/p>\n<p>A representa\u00e7\u00e3o dos n\u00fameros fracion\u00e1ria j\u00e1 era conhecida h\u00e1 quase 3.000 anos, enquanto a forma decimal surgiu no s\u00e9culo XVI com o matem\u00e1tico franc\u00eas Fran\u00e7ois Vi\u00e8te.<\/p>\n<p>O uso dos n\u00fameros decimais \u00e9 bem superior ao dos n\u00fameros fracion\u00e1rios. Observe que nos computadores e nas m\u00e1quinas calculadoras utilizamos unicamente a forma decimal.<\/p>\n<p><b>Fra\u00e7\u00f5es e N\u00fameros Decimais<\/b><\/p>\n<p><b>Observe as fra\u00e7\u00f5es:<\/b><\/p>\n<p class=\"imagem\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-94294\" src=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_726-Jan.-11-12.19.jpg\" alt=\"Numera\u00e7\u00e3o decimal\" width=\"205\" height=\"118\" \/><\/p>\n<p align=\"left\">Os denominadores s\u00e3o pot\u00eancias de 10.<\/p>\n<p><b>Assim:<\/b><\/p>\n<p>Denominam-se fra\u00e7\u00f5es decimais, todas as fra\u00e7\u00f5es que apresentam pot\u00eancias de 10 no denominador.<\/p>\n<p><b>Numera\u00e7\u00e3o decimal &#8211; N\u00fameros Decimais<\/b><\/p>\n<p>O franc\u00eas Vi\u00e8te (1540 \u2013 1603) desenvolveu um m\u00e9todo para escrever as fra\u00e7\u00f5es decimais; no lugar de fra\u00e7\u00f5es, Vi\u00e8te escreveria n\u00fameros com v\u00edrgula. Esse m\u00e9todo, modernizado, \u00e9 utilizado at\u00e9 hoje.<\/p>\n<p><b>Observe no quando a representa\u00e7\u00e3o de fra\u00e7\u00f5es decimais atrav\u00e9s de n\u00fameros decimais:<\/b><\/p>\n<p class=\"imagem\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-94295 size-full\" src=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_727-Jan.-11-12.19.jpg\" alt=\"Numera\u00e7\u00e3o decimal\" width=\"386\" height=\"237\" srcset=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_727-Jan.-11-12.19.jpg 386w, https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_727-Jan.-11-12.19-300x184.jpg 300w\" sizes=\"(max-width: 386px) 100vw, 386px\" \/><\/p>\n<p class=\"imagem\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-94296 size-full\" src=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_728-Jan.-11-12.19.jpg\" alt=\"Numera\u00e7\u00e3o decimal\" width=\"386\" height=\"234\" srcset=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_728-Jan.-11-12.19.jpg 386w, https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_728-Jan.-11-12.19-300x182.jpg 300w\" sizes=\"(max-width: 386px) 100vw, 386px\" \/><\/p>\n<p class=\"imagem\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-94297 size-full\" src=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_729-Jan.-11-12.19.jpg\" alt=\"Numera\u00e7\u00e3o decimal\" width=\"387\" height=\"238\" srcset=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_729-Jan.-11-12.19.jpg 387w, https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_729-Jan.-11-12.19-300x184.jpg 300w\" sizes=\"(max-width: 387px) 100vw, 387px\" \/><\/p>\n<p>Os n\u00fameros 0,1, 0,01, 0,001; 11,7, por exemplo, s\u00e3o n\u00fameros decimais.<br \/>\nNessa representa\u00e7\u00e3o, verificamos que a v\u00edrgula separa a parte inteira da parte decimal.<\/p>\n<p class=\"imagem\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-94298 size-full\" src=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_730-Jan.-11-12.19.jpg\" alt=\"Numera\u00e7\u00e3o decimal\" width=\"450\" height=\"108\" srcset=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_730-Jan.-11-12.19.jpg 450w, https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_730-Jan.-11-12.19-300x72.jpg 300w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/p>\n<p><b>Numera\u00e7\u00e3o decimal<\/b><\/p>\n<p><b>Leitura dos n\u00fameros decimais<\/b><\/p>\n<p><b>No sistema de numera\u00e7\u00e3o decimal, cada algarismo, da parte inteira ou decimal, ocupa uma posi\u00e7\u00e3o ou ordem com as seguintes denomina\u00e7\u00f5es<\/b>:<\/p>\n<p align=\"left\"><b>Partes inteiras:<\/b>\u00a0Centenas, Dezenas e Unidades<\/p>\n<p align=\"left\"><b>Partes decimais:<\/b>\u00a0D\u00e9cimos, Cent\u00e9simos, Mil\u00e9simos, D\u00e9ciomos mil\u00e9simos, Cent\u00e9simos mil\u00e9simos e Milion\u00e9simos.<\/p>\n<p><b>Leitura<\/b><\/p>\n<p><b>Lemos a parte inteira, seguida da parte decimal, acompanhada das palavras:<\/b><\/p>\n<p><b>d\u00e9cimos \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026. :<\/b>\u00a0quando houver uma casa decimal;<br \/>\n<b>cent\u00e9simos\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026 :\u00a0<\/b>quando houver duas casas decimais;<br \/>\n<b>mil\u00e9simos\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026.. :<\/b>\u00a0quando houver tr\u00eas casas decimais;<br \/>\n<b>d\u00e9cimos mil\u00e9simos \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026 :\u00a0<\/b>quando houver quatro casas decimais;<br \/>\n<b>cent\u00e9simos mil\u00e9simos \u2026\u2026\u2026\u2026\u2026\u2026. :<\/b>\u00a0quando houver cinco casas decimais e, assim sucessivamente.<\/p>\n<p><b>Exemplos:<\/b><\/p>\n<p><b>1,2:<\/b>\u00a0um inteiro e dois d\u00e9cimos;<br \/>\n<b>2,34:<\/b>\u00a0dois inteiros e trinta e quatro cent\u00e9simos<\/p>\n<p>Quando a parte inteira do n\u00famero decimal \u00e9 zero, lemos apenas a parte decimal.<\/p>\n<p><b>Exemplos:<\/b><\/p>\n<p><b>0,1 :<\/b>\u00a0um d\u00e9cimo;<br \/>\n<b>0,79 :<\/b>\u00a0setenta e nove cent\u00e9simos<\/p>\n<p><b>Observa\u00e7\u00e3o:<\/b><\/p>\n<p><b>1.<\/b>\u00a0Existem outras formas de efetuar a leitura de um n\u00famero decimal.<\/p>\n<p><b>Observe a leitura do n\u00famero 5,53:<\/b><\/p>\n<p><b>Leitura convencional:<\/b>\u00a0cinco inteiros e cinquenta e tr\u00eas cent\u00e9simos;<\/p>\n<p><b>Outras formas:<\/b>\u00a0quinhentos e cinquenta e tr\u00eas cent\u00e9simos;<br \/>\ncinco inteiros, cinco d\u00e9cimos e tr\u00eas cent\u00e9simos.<\/p>\n<p><b>2.<\/b>\u00a0Todo n\u00fameros natural pode ser escrito na forma decimal, bastando colocar a v\u00edrgula ap\u00f3s o \u00faltimo algarismo e acrescentar zero(s).<\/p>\n<p><b>Exemplos:<\/b><\/p>\n<p>4 = 4,0 = 4,00\u00a0\u00a0\u00a0\u00a0| \u00a0\u00a0\u00a0\u00a075 = 75,0 = 75,00<\/p>\n<p><b>Transforma\u00e7\u00e3o de n\u00fameros decimais em fra\u00e7\u00f5es decimais<\/b><\/p>\n<p>Observe os seguintes n\u00fameros decimais:<img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-94301 alignnone\" src=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_732-Jan.-11-12.22.jpg\" alt=\"Numera\u00e7\u00e3o decimal\" width=\"30\" height=\"41\" \/><\/p>\n<p>0,8 (l\u00ea-se &#8220;oito d\u00e9cimos&#8221;), ou seja, <img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-94303 alignnone\" src=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_734-Jan.-11-12.22.jpg\" alt=\"Numera\u00e7\u00e3o decimal\" width=\"34\" height=\"53\" \/>.<\/p>\n<p>0,65 (l\u00ea-se &#8220;sessenta e cinco cent\u00e9simos&#8221;), ou seja, <img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-94310 alignnone\" src=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_735-Jan.-11-12.221.jpg\" alt=\"Numera\u00e7\u00e3o decimal\" width=\"34\" height=\"43\" \/>.<\/p>\n<p>5,36 (l\u00ea-se &#8220;quinhentos e trinta e seis cent\u00e9simos&#8221;), ou seja,<img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-94306 alignnone\" src=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_737-Jan.-11-12.23.jpg\" alt=\"Numera\u00e7\u00e3o decimal\" width=\"44\" height=\"41\" \/>\u00a0.<\/p>\n<p>0,047 (l\u00ea-se &#8220;quarenta e sete mil\u00e9simos&#8221;), ou seja,<\/p>\n<p><b>Verifique ent\u00e3o que:<\/b><\/p>\n<p class=\"imagem\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-94307 size-full\" title=\"Numera\u00e7\u00e3o decimal\" src=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_738-Jan.-11-12.23.jpg\" alt=\"Numera\u00e7\u00e3o decimal\" width=\"424\" height=\"316\" srcset=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_738-Jan.-11-12.23.jpg 424w, https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_738-Jan.-11-12.23-300x224.jpg 300w\" sizes=\"(max-width: 424px) 100vw, 424px\" \/><\/p>\n<p><b>Assim:<\/b><\/p>\n<p>Um n\u00famero decimal \u00e9 igual \u00e0 fra\u00e7\u00e3o que se obt\u00e9m escrevendo para numerador o n\u00famero sem v\u00edrgula e dando para denominador a unidade seguida de tantos zeros quantas forem as casas decimais.<\/p>\n<p>Transforma\u00e7\u00e3o de fra\u00e7\u00e3o decimal em n\u00famero decimal<\/p>\n<p><b>Observe as igualdades entre fra\u00e7\u00f5es decimais e n\u00fameros decimais a seguir:<\/b><\/p>\n<p class=\"imagem\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-94308 size-full\" src=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_739-Jan.-11-12.23.jpg\" alt=\"Numera\u00e7\u00e3o decimal\" width=\"455\" height=\"317\" srcset=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_739-Jan.-11-12.23.jpg 455w, https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_739-Jan.-11-12.23-300x209.jpg 300w\" sizes=\"(max-width: 455px) 100vw, 455px\" \/><\/p>\n<p><b>Podemos concluir, ent\u00e3o, que:<\/b><\/p>\n<p>Para se transformar uma fra\u00e7\u00e3o decimal em n\u00famero decimal, basta dar ao numerador tantas casas decimais quantos forem os zeros do denominador.<\/p>\n<p><b>Decimais equivalentes<\/b><\/p>\n<p>As figuras foram divididas em 10 e 100 pares, respectivamente. A seguir foram coloridas de verde escuro 4 e 40 destas parte, respectivamente.<\/p>\n<p><b>Observe:<\/b><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-94309 size-full\" src=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_740-Jan.-11-12.23.jpg\" alt=\"Numera\u00e7\u00e3o decimal\" width=\"536\" height=\"317\" srcset=\"https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_740-Jan.-11-12.23.jpg 536w, https:\/\/lab.fabricadelandings.com.br\/portalsaofrancisconovo\/wp-content\/uploads\/2017\/01\/ScreenHunter_740-Jan.-11-12.23-300x177.jpg 300w\" sizes=\"(max-width: 536px) 100vw, 536px\" \/><\/p>\n<p>Verificamos que 0,4 representa o mesmo que 0,40, ou seja, s\u00e3o decimais equivalentes.<\/p>\n<p>Logo, decimais equivalentes s\u00e3o aqueles que representam a mesma quantidade.<\/p>\n<p><b>Exemplos:<\/b><\/p>\n<p>0,4 = 0,40 = 0,400 = 0,4000 8 = 8,0 = 8,00 = 8,000<br \/>\n2,5 = 2,50 = 2,500 = 2,5000 95,4 = 95,40 = 95,400 = 95,4000<\/p>\n<p><b>Dos exemplos acima, podemos concluir que:<\/b><\/p>\n<p>Um n\u00famero n\u00e3o se altera quando se acrescenta ou se suprime um ou mais zeros \u00e0 direita de sua parte decimal.<\/p>\n<p><b>Compara\u00e7\u00e3o de n\u00fameros decimais<\/b><\/p>\n<p>Comparar dois n\u00fameros decimais significa estabelecer uma rela\u00e7\u00e3o de igualdade ou de desigualdade entre eles.<\/p>\n<p><b>Consideremos dois casos:<\/b><\/p>\n<p><b>1\u00ba Caso:\u00a0<\/b>As partes inteiras<\/p>\n<p>O maior \u00e9 aquele que tem a maior parte inteira.<\/p>\n<p><b>Exemplos:<\/b><\/p>\n<p>3,4 &gt; 2,943, pois 3 &gt;2. 10,6 &gt; 9,2342, pois 10 &gt; 9.<\/p>\n<p><b>2\u00ba Caso:<\/b>\u00a0As partes inteiras s\u00e3o iguais<\/p>\n<p>O maior \u00e9 aquele que tem a maior parte decimal. \u00c9 necess\u00e1rio igualar inicialmente o n\u00famero de casas decimais acrescentando zeros.<\/p>\n<p><b>Exemplos:<\/b><\/p>\n<p>0,75 &gt; 0,7 ou 0,75 &gt; 0,70 (igualando as casas decimais), pois 75 &gt; 70.<\/p>\n<p>8,3 &gt; 8,03 ou 8,30 &gt; 8,03 (igualando as casas decimais ), pois 30 &gt; 3.<\/p>\n<p><strong>Fonte:<\/strong>\u00a0Col\u00e9gio S\u00e3o Francisco\/www.math.net\/www.geeksforgeeks.org<\/p>\n","protected":false},"excerpt":{"rendered":"<p>O\u00a0sistema decimal, \u00a0\u00e9 um sistema de numera\u00e7\u00e3o posicional, onde os valores s\u00e3o representados usando como base aritm\u00e9tica os poderes de n\u00famero dez . O conjunto de s\u00edmbolos utilizado (sistema de numera\u00e7\u00e3o \u00e1rabe) consiste em dez figuras:\u00a0a zero (0) \u2013 uma (1) \u2013 dois (2) \u2013 de tr\u00eas (3) \u2013 quatro (4) \u2013 cinco (5) \u2013 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[414],"tags":[],"class_list":["post-94282","post","type-post","status-publish","format-standard","hentry","category-matematica"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Numera\u00e7\u00e3o decimal, Sistema, N\u00fameros Numera\u00e7\u00e3o decimal<\/title>\n<meta name=\"description\" content=\"Numera\u00e7\u00e3o decimal, Sistema, N\u00fameros, M\u00e9todo, Fra\u00e7\u00f5es, Numerador, Forma, Uso, V\u00edrgula, Exemplos, Numera\u00e7\u00e3o 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