Question

Express $45mm$ in $cm$, $m$ and $km$ using decimal.

Answer 1

Step 1: Convert the unit from millimetre to centimetre

Given length, $45mm$.

It is known that, $1mm=\frac{1}{10}cm=0.1cm$.

Thus, $45mm=\left(45\times 0.1\right)cm=4.5cm$.

Therefore, the given length can be expressed in centimetre as $4.5cm$.

Step 2: Convert the unit from millimetre to meter

Given length, $45mm$.

It is known that, $1mm=\frac{1}{1000}m=0.001m$.

Thus, $45mm=\left(45\times 0.001\right)m=0.045m$.

Therefore, the given length can be expressed in meter as $0.045m$.

Step 3: Convert the unit from millimetre to kilometre

Given length, $45mm$.

It is known that, $1mm=\frac{1}{1000000}km=0.000001km$.

Thus, $45mm=\left(45\times 0.000001\right)km=0.000045km$.

Therefore, the given length can be expressed in kilometre as $0.000045km$.

Hence, $\mathbf{45}\mathbf{}\mathit{m}\mathit{m}$ can be expressed as $\mathbf{4}\mathbf{.}\mathbf{5}\mathbf{}\mathit{c}\mathit{m}$, $\mathbf{0}\mathbf{.}\mathbf{045}\mathbf{}\mathit{m}$ and $\mathbf{0}\mathbf{.}\mathbf{000045}\mathbf{}\mathit{k}\mathit{m}$.