Прямоугольники:
1)28*5=140см^2 = 1,4дм^2
2)12*11=132см^2 = 1,32дм^2
3)25*4=100см^2 = 1дм^2
4)50*40=2000см^2 = 20дм^2
5)32*14=448см^2 = 4,48дм^2
Квадраты:
22^2=484см^2 = 4,84дм^2
30^2=900см^2 = 9дм^2
19^2=361см^2 = 3,61дм^2
80^2=6400см^2 = 64дм^2
100^2=10000см^2 = 1м^2