Question

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

• A. $40$ cm
• B. $4$cm
• C. $400$ cm
• D. $0.4$ cm

Answer 1

Answer: (A)

$40$ cm

The total length of the line is $400$ mm.

We know that $1$ $\text{centimeter}=10$ $\text{millimeters}$

$1$ mm $=\frac{1}{10}$ cm

We have to convert the $400$ mm to cm.

$400$ mm $=\frac{1}{10}\times 400$ cm

$=\frac{400}{10}$ cm

$=40$ $\text{centimeter}$

The line is $40$ cm long.

So, option A is correct.