New
New
Year 1

# Measure length using a ruler

I can use a ruler to measure length.

New
New
Year 1

# Measure length using a ruler

I can use a ruler to measure length.

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## Lesson details

### Key learning points

1. Using a ruler means that you all get the same measurement for the same object.
2. When using a ruler always measure starting from zero cm.
3. Each number on the ruler represents one cm.
4. cm is the short form of centimetres.
5. The number on the ruler where the object ends tells you the length of the object.

### Common misconception

Children may align the end of their object with the end of the ruler, rather than zero.

Use a sticker or coloured pen to highlight the zero on the ruler so that children's attention is drawn to the zero when they are measuring length using a ruler.

### Keywords

• Ruler - A tool for measuring length.

• Centimetre - A measure of length (about the width of a fingernail).

• Cm - A shorter way of writing centimetre.

• Zero - A number that shows that there is no amount.

At this stage, it is best if children use rulers where the only scale is in centimetres to avoid confusion with other units such as inches.
Teacher tip

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Starter quiz

### 6 Questions

Q1.
What is the missing from the ruler?
1
6
Q2.
What is the height of the jug? Write the number. centimetres
Q3.
Centimetre cubes are used to measure two robots. True or false? Robot A is 1 centimetre taller than Robot B.
False
Q4.
Who has measured accurately?
a
Q5.
Which car is 15 centimetres in length?
Correct Answer: An image in a quiz
Q6.
Which item is in the wrong place?
pen
eraser

## Exit quiz

### 6 Questions

Q1.
Complete the sentence. Rulers always start at ___ cm.
10
1
Q2.
What is a shorter way of writing centimetres?
c
m
mm
Q3.
How long is the pen?
9 mm
8 cm
Q4.
Complete the sentence. The tower of bricks is cm tall.