How to calculate 63-45-55 + 137 with simple operation

How to calculate 63-45-55 + 137 with simple operation


45+55=100.,63+137=200,200-100=100.



Simple calculation of 0.45 × 0.45 + 0.45 × 0.55


0.45×0.45+0.45×0.55=0.45(0.45+0.55)=0.45



Simple operation of 55 * 25 + 25 × 45


55*25+25*45
=(55+45)*25
=2500
The combination law of multiplication is applied!



Calculation: ① 25 × 32 × 125, ② 45 × 55 + 55 × 55, ③ 102 × 34


①25×32×125，=（25×4）×（8×125），=100×1000，=100000；②45×55+55×55，=（45+55）×55，=100×55，=5500；③102×34，=100×34+2×34，=3400+68，=3468．

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