Setembro

Question 1

99 × 7

Answer 1

(100 × 7) − 7
= 700 − 7
= 693

Question 2

36 × 25

Answer 2

36 × 100) ÷ 4
= 3600 ÷ 4
= 900

Question 3

999 × 37

Answer 3

(1000 × 37) − 37
= 37000 − 37
= 36963

Question 4

25 × 48

Answer 4

(25 × 50) − (25 × 2)
= 1250 − 50
= 1200

Question 5

18 × 50
→ (18 × 100) ÷ 2 = 1800 ÷ 2 = 900