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Question

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


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

The correct option is B $$40$$ cm
The total length of the line is $$400$$ mm.
We know that $$1$$  $$\text{centimeter} =10$$ $$\text{millimeters}$$
$$1$$ mm $$=\dfrac1{10}$$ cm
We 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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