7*12=7*10+2*7=70+14=84; 25*3=20*3+5*3=60+15=75; 18*5=10*5+8*5=50+40=90; 4*21=20*4+4*1=80+4=84
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7*12=7*10+2*7=70+14=84; 25*3=20*3+5*3=60+15=75; 18*5=10*5+8*5=50+40=90; 4*21=20*4+4*1=80+4=84