1.  Find          (a)           (b)           (c)            (d)            (e)           (f)

It is known that the sum of
So, we have to split the number in order to cancel out with other numbers.

(a)
= 15 + (- 20) + 20
= 15 + 0 = 15

(b)
= 72 - (72) - 18
= 0 - 18 = -18

(c)
= (- 15) + 18
= (- 15) + (15) + 3
= 0 + 3 = 3

(d)
= - (20 + 13 )
= -33

(e)
= 23 + 12
= 35

(f)
= (- 32) + 40
= (- 32) + (32) + 8
= 0 + 8
= 8

23_ (_12)

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