25x45x4 =25×4×45=100×45=4500
20x67x5 =20×5×67=100×67=6700
125x25x20x8 =125×8×(25×20)=1000×500=500 000
23x125x8 =23×(125×8)=23×1000=23 000
250x(57x4)=250×4×57=1000×57=57 000
40x22x25=40×25×22=1000×22=22 000
25x45x4=(25x4)x45=100x45=4500; 20x67x5=(20x5)x67=100x67=6700; 125x25x20x8=(125x8)x(25x20)=1000x500=500000; 23x125x8 =23x(125x8)=23x1000=23000; 250x(57x4)=(250x4)x57=1000x57=57000; 40x22x25=(40x25)x22=1000x22=22000
25x125x25=25^3x5=5^7=78125