New
New
Year 1

# Finding one more and one less using representations

You can find one more or one less using representations.

New
New
Year 1

# Finding one more and one less using representations

You can find one more or one less using representations.

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## Lesson details

### Key learning points

1. Secure understanding of one more/one less using using a variety of manipulatives .
2. Use the stem sentence one more than... one less than...
3. Identify a missing number in a sequence.

### Common misconception

Getting numbers in the wrong order when completing the stem sentences with one more and one less.

Use the representations to identify and support understanding of which value is one less and which is one more.

### Keywords

• One more - The next number in the count is one more than the number before and there will be one more object in the set.

• One less - The previous number in the count is one less than the next number and there will be one fewer object in the set.

You may decide not to show all slides to the pupils. Use representations familiar to the pupils so that the focus can be on one more and one less and linking this to the counting sequence they have been rehearsing in previous lessons.
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 of the following comparative sentences is true for these blocks?
B has the same number of blocks as A
Correct answer: B has fewer blocks than A
Correct answer: C has more blocks than A and B
A has more blocks than C
Q2.
Which of the following comparative sentences is true for these blocks?
A and C have the same number of blocks
Correct answer: A has 1 more block than C
Correct answer: B has one fewer block than C
B has more blocks than C
Q3.
Which comparative sentence is true for this number track?
A is more than B
B is equal to A
Correct answer: A is not equal to B
Q4.
Which comparative sentence is true for this number track?
Correct answer: A is less than B
B is less than A
A and B are equal
Q5.
What are the numbers represented here?
12 and 13
13 and 14
15 and 16
Q6.
What is the missing number here?
9
11
12

## Exit quiz

### 6 Questions

Q1.
What number comes before 13 when you are counting to 20?
Q2.
What number comes after 16 when you count from 20 back to zero?
17
16
14
Q3.
What do you notice about these sticks of cubes?
Correct answer: 15 is the shortest stick of cubes
Correct answer: The biggest stick of cubes has 17 bricks
The middle stick of cubes has 15 bricks
Correct answer: 16 is one more than 15
16 is one less than 15
Q4.