1) 2*(50*73956)=(2*50)*73956=100*73956=7395600
2) (25*37896)*4=(25*4)*37896=100*37896=3789600
3) (4873*125)*8=(125*8)*4873=1000*4873=4873000
4) (200-25)*4=200*4-25*4=800-100=700
5) (100+125)*8=100+125*8=100+1000=1100
6) 638*87+362*87=(638+362)*87=1000*87=87 000