Answer :

(i) 1002 – 992

= 100 + 99


= 199


(ii) 1112 - 1092


= 1112 – 1102 + 1102 - 1092


= (111 + 110) + (110 + 109)


= 440


(iii) 992 - 962


= 992 – 982 + 982 – 972 + 972 - 962


= (99 + 98) + (98 + 92) + (97 + 96)


= 585


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