Usage of decimals in length — lesson. Mathematics State Board, Class 7.

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We can use decimals to measure the length of the object.

Kilometre

$(km)$ , Metre

$(m)$ , Centimetre

$(cm)$ and Millimetre

$(mm)$ are the measurements used to measure length.

$\begin{array}{l} 1 m = \frac{1}{1000} km = 0.001 km \\ 1 cm = \frac{1}{100} m = 0.01 m \\ 1 mm = \frac{1}{10} cm = 0.1 cm \end{array}$

Example:

1. Convert

$7$

$m$ to

$km$ .

$\begin{array}{l} 1 m = \frac{1}{1000} km \\ 7 m = \frac{7}{1000} km = 0.007 km \end{array}$

Therefore,

$7$

$m$

$=$

$0.007$

$km$ .

2. Convert

$56$

$mm$ to

$cm$

$\begin{array}{l} 1 mm = \frac{1}{10} cm \\ 56 mm = \frac{56}{10} cm = 5.6 cm \end{array}$

Therefore,

$56$

$mm$

$=$

$5.6$

$cm$ .

Did you find an error?

5. Usage of decimals in length