Question

a) 10 m + 10 m
80 cm + 10 cm
10 dm + 20 dm
b) 12 cm : 2
8 m x 3
5 mm + 4 mm
c) 54 m:6
9 mx 5
100 cm - 20 cm
d) 100 cm - 40 cm
70 cm - 30 cm
10 dm x 10​

Answer 1

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

Answer 2

Răspuns:

a) 23,9 m

b) 4,15 mm

c) 39,71 m

d) 100 dm

Explicație pas cu pas:

a)  10 m + 10 m  + 80 cm + 10 cm  + 10 dm + 20 dm =

   20 m + 30 dm + 90 cm =

   2000 cm + 300 cm + 90 cm = 2390 cm = 239 dm = 23,9 m

b) 12 cm : 2 8 m x 3 5 mm + 4 mm =

   12 cm : 2800 cm x 3,5 cm + 0,4 cm =

   0,0042 cm x 3,5 cm +0,4 cm =

  0,015 cm + 0,4 cm = 0,415 cm =4,15 mm

c) 54 m : 6 9 m x 5 100 cm - 20 cm =

   0,78 m x 51 m -0,2 m =

   39,91 m - 0,2 m = 39,71 m

d)  100 cm - 40 cm  = 60 cm

70 cm - 30 cm  = 40 cm

10 dm x 10​ = 100 dm