Răspuns:
a)4×12=4×(10+2)=4×10+4×2=40+8=48
b) 3×32=3×(30+2)=3×30+3×2=90+6=96
c)3×23=3×(20+3)=3×20+3×3=60+9=69
d) 2×32=2×(30+2)=2×30+2×2=60+4=64