99 2 = 90+990 + 990+9 2 = 90 2 + 9 2 = 180 + 18 = 198897 7 = 800+90+7800 + 90 + 7800+90+7 7 = 800 7 + 90 7 + 7 7 = 5600 + 630 + 49 = 6279403 6 = 400+3400 + 3400+3 6 = 400 6 + 3 6 = 2400 + 18 = 24182 150−5150 - 5150−5 = 2 * 145 = 290
99 2 = 90+990 + 990+9 2 = 90 2 + 9 2 = 180 + 18 = 198
897 7 = 800+90+7800 + 90 + 7800+90+7 7 = 800 7 + 90 7 + 7 7 = 5600 + 630 + 49 = 6279
403 6 = 400+3400 + 3400+3 6 = 400 6 + 3 6 = 2400 + 18 = 2418
2 150−5150 - 5150−5 = 2 * 145 = 290