Measuring Lengths - Cycle 3

| Mathematics

How do I read a measurement in decimals on a ruler?

Rule
  1. To measure length in decimals, I look at the cm.
  2. Next, I look at the mm.
Example

What is the measurement of the following line in cm?

Exemple de mesure en nombres décimaux - image 1

  1. To measure length in decimals, I look at the cm.

    Since the measurement exceeds the 7 cm line but does not reach the 8 cm line, I know that the whole part of my answer is 7.

Exemple de mesure en nombres décimaux - image 2
  1. Next, I look at the mm.

    Since the length of the line ends at 4 mm after the 7, the answer is 7.4 cm, which is equivalent to 74 mm.

Exemple de mesure en nombres décimaux - image 3

The line measures 7.4 cm.