Fill in the blanks
(iii) 7−18=....... and (7−18)−5=....... 18−5=....... and 7−(18−5)=.......
Is (7−18)−5=7−(18−5) ? ⇒ Subtraction of whole numbers is not ______
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Solution
7−18=−11 and (7−18)−5=−11−5=−16 ...(i) 18−5=13 7−(18−5)=7−13=−6 ...(ii)
From (i) and (ii) (7−18)−5≠7−(18−5)
Hence, subtraction of whole numbers is not associative.