Comparing and measuring · Grade R
In Grade R you learn: longer, shorter, heavier and lighter.
Measuring tells us how long, how heavy or how much something holds. First we compare — longer or shorter, heavier or lighter, more or less — and then we measure with rulers, scales and jugs, using units like centimetres, kilograms and millilitres.
Key facts
- When you use a ruler, line the end of the object up with 0.
Worked examples
Example 1
Which is heavier: a watermelon or a strawberry?
Answer: A watermelon
Example 2
The crayon does not start at 0. How long is it?
Answer: 7 cm