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Question

Find:

(a) 35 − (20) (b) 72 − (90)

(c) (− 15) − (− 18) (d) (− 20) − (13)

(e) 23 − (− 12) (f) (− 32) − (− 40)

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Solution

(a) 35 − 20 = 15

(b) 72 − 90 = −18

(c) −15 − (−18) = − 15 + 18 = 3

(d) − 20 − 13 = −33

(e) 23 − (−12) = 23 + 12 = 35

(f) (−32) − (−40) = −32 + 40 = 8


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