Răspuns:
a)1/2×76= 38
1/2×2022=1011
1/2×8/5=8/10=4/5
b)1/3×354=118
1/3×69/2= 69/6=23/2
1/3×111/7=111/21=37/7
c)3/10×70=210/70=3
3/10×140/3= 420/30= 84/6= 42/3= 14
3/10×1000/9=3000/90=600/18=200/6=100/3
d)31/2+1/4= 62/4+1/4=63/4
8/21×63/4=504/84=252/42=126/21=42/7=6.