Question

2)Efetue adições e subtrações a seguir

Answer 1

A) 4/7 + 2/7 = 6/7

B)8/5 - 3/5 = 5/5 = 1

C)3/10 + 1/4 =

MMC

10 , 4   2

5 , 2   2

5 , 1    5 = 5 . 2 . 2 =20

 1

20 : 10 = 2 . 3 = 6/20

20 : 4 = 5 . 1 = 5/20

6/20 + 5/20 = 1/20

D)4/5 - 2/3 =

MMC

5 , 3   3

5 , 1    5 = 5 . 3 = 15

1

15 : 5 = 3 . 4 = 12/15

15 : 3 = 5 . 2 = 10/15

12/15 - 10/15 = 2/15

E)9/8 - 1/4 =

MMC

8 , 4   2

4 , 2   2

2 , 1    2 = 2 . 2 . 2 = 8

1

8 : 8 = 1 . 9 = 9/8

8 : 4 = 2 . 1 =2/8

9/8 - 2/8 = 7/8

F)5/8 - 3/8 - 1/8 = 1/8

G)3/25 + 2/5 =

MMC

25 , 5   5

 5 ,  5   5 = 5 . 5 = 25

  1 , 1

25 : 25 = 1 . 3 = 3/25

25 : 5 = 5 . 2 = 10/25

3/25 + 10/25 = 13/25

H)9/6 - 2/3 =

MMC

6 , 3   2

3 , 3   3 = 3 . 2 = 6

1 , 1

6 : 6 = 1 > 9 = 9/6

6 : 3 = 2 . 2 = 4/6

9/6 - 2/3 = 5/6