Question

a) 72 + 20 

68 – 40 

350 + 30

970 – 70 

b) 411 + 300 

625 + 200 

954 – 400 

367 – 300 

c) 32 + 7 + 8 

54 + 7 + 3 

1 + 16 + 9 

96 + 40 + 4 

Answer 1

a) 72 + 20 = 92

68 – 40 = 28

350 + 30= 380

970 – 70 = 900

b) 411 + 300 = 7811

625 + 200 = 825

954 – 400 = 554

367 – 300 =67

c) 32 + 7 + 8 = (32+8)+7=40+7=47

54 + 7 + 3 = 54 + (7+3)= 54+10=64

1 + 16 + 9 = (1+9)+16=10+16=26

96 + 40 + 4 = (96+4)+40=100+40=140