02. Frações e números decimais - Passei.com.br
02. Frações e números decimais - Passei.com.br
02. Frações e números decimais - Passei.com.br
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8<<strong>br</strong> />
25<<strong>br</strong> />
5<<strong>br</strong> />
8<<strong>br</strong> />
4<<strong>br</strong> />
7<<strong>br</strong> />
= 8 ¸ 25 = 0,32 = 32%<<strong>br</strong> />
= 5 ¸ 8 = 0,625 = 62,5%<<strong>br</strong> />
= 4 ¸ 7 @ 0,5714 = 57,14%<<strong>br</strong> />
A U L A<<strong>br</strong> />
2<<strong>br</strong> />
Repare que nesse último exemplo fizemos uma aproximação.<<strong>br</strong> />
Na prática, usamos duas ou, no máximo, três casas <strong>decimais</strong> em nossas<<strong>br</strong> />
aproximações.<<strong>br</strong> />
Exercício 1<<strong>br</strong> />
Simplifique as frações abaixo. Exemplo:<<strong>br</strong> />
18<<strong>br</strong> />
42 = 18 ¸ 2<<strong>br</strong> />
42 ¸ 2 = 9 21 = 9 ¸ 3<<strong>br</strong> />
21 ¸ 3 = 3 7<<strong>br</strong> />
a) 20<<strong>br</strong> />
32<<strong>br</strong> />
c)<<strong>br</strong> />
320<<strong>br</strong> />
400<<strong>br</strong> />
b) 24<<strong>br</strong> />
36<<strong>br</strong> />
d)<<strong>br</strong> />
10<<strong>br</strong> />
100<<strong>br</strong> />
Exercício 2<<strong>br</strong> />
Complete os espaços abaixo <strong>com</strong> os sinais de < (menor), > (maior)<<strong>br</strong> />
ou = (igual). Exemplo: 2<<strong>br</strong> />
Solução:<<strong>br</strong> />
3 .... 5 8<<strong>br</strong> />
2<<strong>br</strong> />
3 = 2 ´ 8<<strong>br</strong> />
3 ´ 8 = 16<<strong>br</strong> />
}<<strong>br</strong> />
24 16<<strong>br</strong> />
24 > 15<<strong>br</strong> />
24 ® 2 3 > 5 8<<strong>br</strong> />
5<<strong>br</strong> />
8 = 5 ´ 3<<strong>br</strong> />
8 ´ 3 = 15<<strong>br</strong> />
24<<strong>br</strong> />
Exercícios<<strong>br</strong> />
a) 5 8 .... 3 5<<strong>br</strong> />
c)<<strong>br</strong> />
5 23<<strong>br</strong> />
....<<strong>br</strong> />
6 24<<strong>br</strong> />
b) 2 3 .... 5 9<<strong>br</strong> />
d)<<strong>br</strong> />
8 20<<strong>br</strong> />
....<<strong>br</strong> />
10 25<<strong>br</strong> />
Exercício 3<<strong>br</strong> />
Efetue:<<strong>br</strong> />
a) 3 8 + 1 6<<strong>br</strong> />
c)<<strong>br</strong> />
1<<strong>br</strong> />
4 - 1 6<<strong>br</strong> />
b)<<strong>br</strong> />
3<<strong>br</strong> />
10 - 4<<strong>br</strong> />
15<<strong>br</strong> />
d) 1 2 + 1 3 + 1 5
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