New
New
Year 1

# Show one more and one less than a number using representations

I can use representations to show that the number before a given number is one less and the number after a given number is one more.

New
New
Year 1

# Show one more and one less than a number using representations

I can use representations to show that the number before a given number is one less and the number after a given number is one more.

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## Lesson details

### Key learning points

1. The number before a given number is one less than it.
2. The number after a given number is one more than it.
3. A staircase of blocks can be used to highlight one more and one less.

### Common misconception

Children may confuse one more and one less, particularly when finding missing numbers.

Use the stem sentence ___ is one more / one less than ___ because it comes after / before it in our count.

### Keywords

• One more - The number after a given number is one more than it.

• One less - The number before a given number is one less than it.

• Before - A number that is before another comes earlier in our count.

• After - A number that is after another comes later in our count.

Ask children to describe each column from the staircase to make links to previous work partitioning 1 to 5 eg. 2 is one more than 1. In this lesson, you start to make links to the bar model which will be introduce later in the unit.
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 next number in the count when counting forwards from 2? 2, 3, _
2
3
Q2.
What is the next number when counting back from 5? 5, 4, _
4
5
Q3.
What is one more than 4?
3
4
Q4.
What is one less than 4?
4
5
Q5.
What is the whole?
1
3
Q6.
What is the whole?
1
4

## Exit quiz

### 6 Questions

Q1.
Which part-part-whole model is showing Laura’s cubes correctly partitioned?
Correct Answer: An image in a quiz
Q2.
Which part-part-whole model is showing Andeep’s cubes correctly partitioned?
Correct Answer: An image in a quiz
Q3.
One more than 3 is 4, so one less than 4 is _
2
4
Q4.
One less than 5 is 4, so one more than 4 is _
3
4