New
New
Year 3

# Solve problems by counting forwards and backwards in multiples of 2, 20, 5, 50 and 25

I can solve problems by counting in multiples of 2, 20, 5, 50 and 25.

New
New
Year 3

# Solve problems by counting forwards and backwards in multiples of 2, 20, 5, 50 and 25

I can solve problems by counting in multiples of 2, 20, 5, 50 and 25.

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## Lesson details

### Key learning points

1. Scales are marked in different ways.
2. Counting in 20s, 50s or 25s can help identify missing numbers.
3. Knowing patterns can help you recognise whether numbers are multiples of 20, 25 or 50

### Common misconception

Pupils may struggle to find missing numbers where they are given the start and end numbers only.

Draw attention to the patterns in the counts (e.g. 5 and 0 of counting in 5s and 50s) so that pupils recognise multiples of numbers.

### Keywords

• Multiple - A multiple is the result of multiplying a number by another whole number.

• Pattern - A pattern is when objects or numbers are arranged following a rule. A pattern is a repeated set of numbers, shapes or objects.

Pupils will need lots of practise counting in multiples of 2, 20, 5, 50 and 25 before the lesson. Encourage pupils to use 'trial and improvement' as well as knowledge of multiples to find missing numbers when counting forwards and backwards.
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.
Which multiple of 20 comes next: 120, 140, 160, ?
Q2.
Order the numbers so that the count is in the correct order, starting with the smallest.
1 - 150
2 - 200
3 - 250
4 - 300
5 - 350
Q3.
What number is missing from the number track?
Q4.
What number is missing from the number track?
Correct Answer: 480, four hundred and eighty
Q5.
What are the next three numbers in this count: 585, 590, 595, ___, ___, ___
500, 505, 510
500, 550, 600
600, 625, 650
Q6.
Andeep counts backwards in multiples of 25. What number has he missed from his count?

## Exit quiz

### 6 Questions

Q1.
When you count in multiples of 20...
...the ones digit is always 2, 4, 6, 8 or 0
Correct answer: ...the tens digit is always 2, 4, 6, 8 or 0
...the ones digit is always 5 or 0
...the tens digit is always 5 or 0
Q2.
Which of these numbers are multiples of 25?
355
520
Q3.
Look at the number line. The count is in multiples of