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Exercise 1B
Use commutative and associative property of addition to simplify the following. One has been don
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you.
* 7+8+3 + 2 = (7 + 3) + (8 + 2) = 10 + 10 = 20
c43 +21 + 79 =
2 Fill in the boxes.
a 5+3=0+5
• (-4) + (-5)=+(-4)
e pir=+p
b 89 +36 +64 + 11 =
d 64+ 26 + 74 +36=
• (-7)+=5+(-7)
d [(-7)+(-a)] = +67
fI+=m+1
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