Question

FOLOSIND PROPRIETATILE INMULTIRII CA IN EXEMPLUL DAT CALCULEAZA RAPID
5*14=5*2*7=10*7=70
5*160=
22*5=
120*5=

Answer 1

5x14=10x7=70
5x160=5x100+5x60=800
22x5=20x5+2x5=110
120x5=100x5+20x5=600

Answer 2

5*14=5*2*7=10*7=70
5*160=5*16*10=5*4*4*10=20*40=800
22*5=11*2*5=11*10=110
120*5=12*10*5=6*2*10*5=6*5*2*10=30*20=600