Question
Compute each of the following: [4 MARKS]
(a) 15+(−5)+15+(−7)
(b) 34+(−20)+16+(−10)
(c) 32+16+9+(−70)
(d) −3+(−2)+(−5)+7
Answer: Option A
:
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Each option: 1 Mark
(a). [15+(−5)]+[15+(−7)]
⇒10+8
⇒18
(b). [34+(−20)]+[16+(−10)]
⇒14+6
⇒20
(c). [32+16]+[9+(−70)]
⇒[48+(−61)]
⇒48−61
⇒−13
(d). [−3+(−2)]+[(−5)+7]
⇒−5+2
⇒−3
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