1. a) (6+8)÷2=14:2=7
b) (9+6)÷3=15:3=5
c) (12+12)÷6=24:6=4
d) (9+15)÷3=24:3=8
2. a) (20+10)÷5=(20÷5) +(10÷5)=4+2=6
b) (12+9)÷3=(12÷3)+(9÷3)=4+3=7
c) (16+8)÷4=(16÷4)+(8÷4)=4+2=6
d) (25+15)÷5=(25÷5)+(15÷5)=5+3=8
3. a) (20-10):5=10÷5=2
b) (15-6)÷3=9÷3=3
c) (18-8)÷2=10÷2=5
d) (24-16)÷4=8÷4=2
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