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1) Problemas de conversão:
a) Quantos ares têm uma área de 250 m2
?
Resposta: Como cada are tem 100 m2
, basta dividirmos 250 m2
por 100 m2
= 2,5
Logo, 250 m2
correspondem a 2,5 a.
b) Quantos decímetros quadrados têm 14 a?
Resposta: Como cada are têm 100 m2
, temos, 14 x 100 = 1 400 m2
Como nosso problema nos pede a resposta em decímetros, fazemos a conversão de 1400 m2
para dm2
, ou seja, 1
400 x 100 = 140 000 dm2
.
Logo, 14 a correspondem a 140 000 dm2
.
c) Quantos hectares correspondem 995000 m2
?
Resposta: Como cada ha têm 10000 m2
, basta dividirmos a área dada em 10000 partes iguais:
995000 : 10 000 = 9,5
Logo, 995 000 m2
correspondem a 9,5 ha.
d) Quantos m2
corespondem a 22,8 ha?
Resposta: Para transformar ha em m2
, multiplicamos a quantidade de ha por 10 000 m2
:
22,8 x 10000 = 228 000 m2
.
Logo, 22,8 ha correspondem a 228000 m2
.
e) Quantos alqueires paulista tem uma área de 121 000 m2
?
Resposta: Como 1 alqueire paulista = 24200 m2
.
Basta:
121000 : 24200 = 5
Logo, 121 000 m2
correspondem a 5 alqueires paulista.
f) Quantos alqueires mineiro têm uma área de 532400 m2
?
Resposta: Como 1 alqueire mineiro = 48400 m2
.
532400 : 48400 = 11
Logo, 532 400 m2
correspondem a 11 alqueires mineiro.
2) Situações problema
a) O Parque Nacional da Serra da Canastra (MG) tem 71525 ha. Quantos alqueires paulistas tem o parque
mineiro?
Resposta: Sabemos que o parque mineiro tem 71525 ha. Para sabermos quantos metros quadrados
correspondem esta área, multiplicamos este valor por 10 000.
71525 x 10 000 = 715250000 m2
Cada alqueire paulista corresponde a 24 200 m2
, assim temos:
715250000 : 24200 ≅ 29555
O Parque Nacional da Serra da Canastra tem então aproximadamente 29555 alqueires paulistas.
b) Uma propriedade rural, de forma retangular, mede 2420 m por 540 m.
 a) Quantos alqueires mineiros tem essa propriedade?
 b) Qual o valor da propriedade se o alqueire mineiro custa R$ 7200,00?
 c) Quantos hectares tem essa propriedade?
Resposta:
a) Primeiro precisamos calcular a área da propriedade. Para isso basta:
2420 x 540 = 1306800 m2
Sabendo que 1 alqueire mineiro é igual a 48400 m2
, basta dividir:
1306800 : 48400 = 27 alqueires mineiro.
b) 27 x 7200 = 194400
Portanto, R$ 194400,00.
c) Como cada ha têm 10000 m2
, basta dividir:
1306800 : 10000 = 130,68 hectares.

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Agrárias

  • 1. 1) Problemas de conversão: a) Quantos ares têm uma área de 250 m2 ? Resposta: Como cada are tem 100 m2 , basta dividirmos 250 m2 por 100 m2 = 2,5 Logo, 250 m2 correspondem a 2,5 a. b) Quantos decímetros quadrados têm 14 a? Resposta: Como cada are têm 100 m2 , temos, 14 x 100 = 1 400 m2 Como nosso problema nos pede a resposta em decímetros, fazemos a conversão de 1400 m2 para dm2 , ou seja, 1 400 x 100 = 140 000 dm2 . Logo, 14 a correspondem a 140 000 dm2 . c) Quantos hectares correspondem 995000 m2 ? Resposta: Como cada ha têm 10000 m2 , basta dividirmos a área dada em 10000 partes iguais: 995000 : 10 000 = 9,5 Logo, 995 000 m2 correspondem a 9,5 ha. d) Quantos m2 corespondem a 22,8 ha? Resposta: Para transformar ha em m2 , multiplicamos a quantidade de ha por 10 000 m2 : 22,8 x 10000 = 228 000 m2 . Logo, 22,8 ha correspondem a 228000 m2 . e) Quantos alqueires paulista tem uma área de 121 000 m2 ? Resposta: Como 1 alqueire paulista = 24200 m2 . Basta: 121000 : 24200 = 5 Logo, 121 000 m2 correspondem a 5 alqueires paulista. f) Quantos alqueires mineiro têm uma área de 532400 m2 ? Resposta: Como 1 alqueire mineiro = 48400 m2 . 532400 : 48400 = 11 Logo, 532 400 m2 correspondem a 11 alqueires mineiro.
  • 2. 2) Situações problema a) O Parque Nacional da Serra da Canastra (MG) tem 71525 ha. Quantos alqueires paulistas tem o parque mineiro? Resposta: Sabemos que o parque mineiro tem 71525 ha. Para sabermos quantos metros quadrados correspondem esta área, multiplicamos este valor por 10 000. 71525 x 10 000 = 715250000 m2 Cada alqueire paulista corresponde a 24 200 m2 , assim temos: 715250000 : 24200 ≅ 29555 O Parque Nacional da Serra da Canastra tem então aproximadamente 29555 alqueires paulistas. b) Uma propriedade rural, de forma retangular, mede 2420 m por 540 m.  a) Quantos alqueires mineiros tem essa propriedade?  b) Qual o valor da propriedade se o alqueire mineiro custa R$ 7200,00?  c) Quantos hectares tem essa propriedade? Resposta: a) Primeiro precisamos calcular a área da propriedade. Para isso basta: 2420 x 540 = 1306800 m2 Sabendo que 1 alqueire mineiro é igual a 48400 m2 , basta dividir: 1306800 : 48400 = 27 alqueires mineiro. b) 27 x 7200 = 194400 Portanto, R$ 194400,00. c) Como cada ha têm 10000 m2 , basta dividir: 1306800 : 10000 = 130,68 hectares.