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Question
Find the sum of:
–50, –200 and 300
Sum
Solution
(–50) + (–200) + (+300)
= (–50) + (–200) + (+200) + (+100)
= (–50) + 0 + (+100) ...[∵ (–a) + (+a) = 0]
= (–50) + (+100)
= (–50) + (+50) + (+50)
= 0 + (+50) ...[∵ (–a) + (+a) = 0]
= 50
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