(100+15)·4 = (100·4) + (15·4) = 400 + 60 = 460(80-4)·5 = (80·5) - (4·5) = 400 - 20 = 380(90+7)·5 = (90·5) + (7·5) = 450 + 35 = 485(60-2)·3 = (60·3) - (2·3) = 180 - 6 = 174(50+8)·4 = (50·4) + (8·4) = 200 + 32 = 232(70-3)·2 = (70·2) - (3·2) = 140 - 6 = 134.
(100+15)·4 = (100·4) + (15·4) = 400 + 60 = 460
(80-4)·5 = (80·5) - (4·5) = 400 - 20 = 380
(90+7)·5 = (90·5) + (7·5) = 450 + 35 = 485
(60-2)·3 = (60·3) - (2·3) = 180 - 6 = 174
(50+8)·4 = (50·4) + (8·4) = 200 + 32 = 232
(70-3)·2 = (70·2) - (3·2) = 140 - 6 = 134.