Răspuns :
10m+10m=20m
80cm+10cm=90cm
10dm+20dm=30dm
12cm:2= 6
8m*3= 24
5mm+4mm+9mm
54m:6=9
9m*5=45
100cm-20cm=80cm
100cm-40cm=60cm
70cm-30cm=40cm
10dm*10=100
80cm+10cm=90cm
10dm+20dm=30dm
12cm:2= 6
8m*3= 24
5mm+4mm+9mm
54m:6=9
9m*5=45
100cm-20cm=80cm
100cm-40cm=60cm
70cm-30cm=40cm
10dm*10=100