1) 2520574 = 25(20574) = 25280 = 70002) 2542+1542 = 42(25+15) = 4240 = 16803) (200-4)25 = 196*25 = 4900
1) 2520574 = 25(20574) = 25280 = 7000
2) 2542+1542 = 42(25+15) = 4240 = 1680
3) (200-4)25 = 196*25 = 4900