Question

Observe a multiplicação abaixo:
7x53 = (7x50+3)
= 7x50 + 7x3
= 350+21
= 371
Efetue usando o modelo
a) 5x21 b) 8x34
c) 9x57 d) 6x123

Answer 1

a) 5x2+1

10+1

11

b) 8x3+4

24+4

28

c) 9x5+7

45+7

52

d)6x1+2+3

6+2+3

8+3

11

Answer 2

A)5 × 20 + 1=

5 × 20 + 5 × 1=

100 + 5 = 105

B) 8 × 30 + 4

8 × 30 + 8 × 4

240 + 32 = 272

C) 9 × 50 + 7

9 × 50 + 9 × 7

450 + 63 = 513

D) 6 × 100 + 20 + 3

6 × 100 + 6 × 20 + 6 × 3

600 + 120 + 3 = 723