Question

Tính nhẩm:

8 + 2 38 + 2 98 + 2

9 + 5 19 + 5 29 + 5

13 – 4 23 – 4 83 – 4

10 – 3 50 – 3 100 – 3

 

Answer 1

8 + 2 = 10 38 + 2 = 40 98 + 2 = 100

9 + 5 = 14 19 + 5 = 24 29 + 5 = 34

13 – 4 = 9 23 – 4 = 19 83 – 4 = 79

10 – 3 = 7 50 – 3 = 47 100 – 3 = 97