Question

# Rosy measured a line for his art project. It is $$400$$ millimeters long. How many centimeters is the line?

A
40 cm
B
4cm
C
400 cm
D
0.4 cm

Solution

## The correct option is B $$40$$ cmThe total length of the line is $$400$$ mm.We know that $$1$$  $$\text{centimeter} =10$$ $$\text{millimeters}$$$$1$$ mm $$=\dfrac1{10}$$ cmWe have to convert the $$400$$ mm to cm.$$400$$ mm $$=\dfrac1{10} \times 400$$ cm$$=\dfrac{400}{10}$$ cm$$= 40$$   $$\text{centimeter}$$The line is  $$40$$ cm long.So, option A is correct.Mathematics

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