calculeaza in doua moduri: va rog Dau coroană!!

Răspuns:
a) 28×10=280 25×10+3×10=250+30=280
b) 100×6=600 100×4+100×2=400+200=600
c) (46-4)×10=42×10=420 46×10-4×10=460-40=420
d) 82×100=8200 85×100-3×100=8500-300=8200