The most common mistake
Children often start measuring from the end of the ruler, or from 1. On the printed-ruler sheets every object starts exactly at zero; on the “use your own” sheets they have to line it up themselves.
Real size
Every sheet is drawn to scale, so the objects are as long on paper as their measurements say. That makes it easy to check an answer with a real ruler.
In the MOE curriculum
- K1–K2The NEL Framework includes comparing and ordering things by length and height.
- Primary 1Measuring and comparing length in centimetres, and measuring or drawing a line to the nearest cm.
- Primary 2Length in metres, with mass in kilograms and grams and volume in litres.
- Primary 3Kilometres, and converting between compound units such as metres and centimetres.
Singapore measures in metric units only, so keep this maker on centimetres: inches do not appear in the syllabus. Children write the unit as cm from Primary 1, so expect “7 cm”, not just 7, in every answer.
The P1 syllabus also asks children to draw a line of a given length. On the back of the sheet, have them draw a line as long as each object, then check a partner’s lines with a ruler.
Summarised in our own words from the MOE Primary Mathematics Syllabus (2021, updated October 2025) and the Nurturing Early Learners Framework (2022).
