Question

1- Escreva frações equivalentes a:

A) 2/3 = ---,---,---,---,---

B) 1/7 = ---,---,---,---,---

C) 4/5 = ---,---,---,---,---

D) 3/8 = ---,---,---,---,---

2- Responda:

A) Qual a fração equivalente a 1/2 do denominador 14 ?

B) Qual a fração equivalente a 3/5 do denominador 25 ?

C) Qual a fração equivalente a 5/7 do numerador 15 ?

D) Qual a fração equivalente a 5/3 do numerador 30 ?

Answer 1

A)
2/3 = 4/6 = 6/9 = 8/12 = 10/15 = 12/18
B)
1/7 = 2/14 = 3/21 = 4/28 = 5/35 = 6/42
C)
4/5 = 8/10 = 12/15 = 16/20 = 20/25 = 24/30
D) 
3/8 = 6/16 = 9/24 = 12/32 = 15/40 = 18/48

2A)
1/2 = x/14 --> 14:2 = 7 --> 7x1 = 7 --> 7/14
2B)
3/5 = x/25 --> 25:5 = 5 --> 5x3 = 15 --> 15/25
2C)
5/7 = 15/x --> 15:5 = 3 --> 7x3 = 21 --> 15/21
2D)
5/3 = 30/x --> 30:5 = 6 --> 6x3 = 18 --> 30/18