Simplify
1) 322. 391 2) 247
209
3)117
156
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1.ans:- 322•391
=(300+22)(400-9)
= 120000-2700+8800-198
= 120000+6100-198
= 125902
2.ans:- 247•209
= (300-53)(200+9)
= 300(200+9)-53(200+9)
= 60000+2700-10600-477
= 60000-7900-477
= 51623
3.ans:- 117•156
= (100+17)(100+56)
= 10000+5600+1700+952
= 18252
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