Question

2/8+1/4=
15 x 2/3 =
3/7x14=
3/4x1/5=
3/8x5/2x1/2=
4/9x3/2x3/7=
18/25x5/12=

Answer 1

a) 2/8 + 1/4 (tire o mmc entre 8 e 4)
=4/8

b)15×2/3 (15×2=30 e 1×3= 3)
30/3 = 10

c)3/7×14/1= (3×14=42 e 7×1=7)
42/7= 6

d)3/4×1/5= (3×1=3 e 4×5=20)
=3/20

e) 3/8×5/2×1/2= (resolva de dois em dois)
(3×5=15 e 8×2=16)
15/16×1/2= 15/32

f)4/9×3/2×3/7=(resolva de dois em dois)
(4×3=12 e 9×2=18)
12/18 × 3/7
(12×3= 36 e 18×7=126)
36/126 = 2/7 (simplifiquei)

g)18/25×5/12
(18×5=90 e 25×12= 300)
90/300= 3/10 (simplifiquei)