Write in decimal form: 3 cm 7 mm = ? cm

[math_celebrity]

Write in decimal form: 3 cm 7 mm = ? cm

Remember that 1 cm = 10 mm
Which means 1 mm = 1/10 cm = 0.1 cm

So 7 mm = 7/10 cm = 0.7 cm

Therefore, 3 cm 7 mm = 3.7 cm