Help me with length!!!?

Question

1 dm=____cm

1 cm=____mm

add: 31 mm +47mm +15 mm. rename in centimeters

add: 6.1 cm+85 mm+2.20 dm. give answer in centimeters

multiply: 63 cm. x 8. give answer in meters

divide: 1.05 m. divided by 5. give answer in millimeters

Answer 1

1 dm = 10 cm

1 cm = 10 mm

31 mm + 47mm + 15 mm =

93 mm * (cm / 10 mm) =

9.3 cm

6.1 cm + 85 mm + 2.20 dm =

6.1 cm + [85 mm * (cm / 10 mm)] + [2.20 dm * (10 cm/dm)] =

6.1 cm + 8.5 cm + 0.22 cm =

14.82 cm

63 cm x 8 =

504 cm * (m / 100 cm) =

5.04 m

1.05 m / 5 =

0.21 m * (1000 mm / m) =

210 mm

Answer 2

1 m=10 dm

1 dm=10 cm

1 cm=10 mm

31 mm +47mm +15 mm=9.3 cm

6.1 cm+85 mm+2.20 dm=36.6 cm

63 cm. x 8=5.04 m

1.05 m. divided by 5=210 mm

Answer 3

1dm = 10 cm

1cm = 10 mm

31+47+15=93mm or 9.3cm

6.1+8.5+22 = 36.6cm

63*8=504cm=5.04meters

1.05/5=.21m=21cm=210mm