New
New
Year 3

# Find 10 more or 10 less than a given number

I can find 10 more and 10 less than a number up to 200

New
New
Year 3

# Find 10 more or 10 less than a given number

I can find 10 more and 10 less than a number up to 200

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## Lesson details

### Key learning points

1. When you count in tens, the ones digit stays the same.
2. When you count in tens, the tens and hundreds digits may change.
3. Knowledge of place value can help when counting forwards across the 100 boundary.

### Common misconception

Pupils may make errors when crossing the 100s boundary, either when adding or subtracting.

Emphasise that ten 10s are equal to 100. When using base ten blocks, pupils should be encouraged to change ten 10s into one hundred.

### Keywords

• Multiple - The result of multiplying a number by another whole number.

• 100s boundary - The point at which the numbers change into 100s numbers, or from one set of hundreds to another.

Many pupils will find base ten blocks helpful to represent the problems in this lesson. They may also find number lines representations helpful too. Both support pupils in seeing the relative size of the numbers they are calculating with.
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 number comes next? 10, 20, 30...
Q2.
What number comes next? 80, 70, 60...
Q3.
What number is represented by the base ten blocks?
40
50
70
Q4.
What number is represented by the arrow?
Q5.
What is the missing number? + 1 = 100
Q6.
Match the equations to their answers.

95

93

Correct Answer:93 + 1 = ,94

94

92

## Exit quiz

### 6 Questions

Q1.
What is 130 + 10?
104
120
131
Q2.
What is 160 − 10?
Correct Answer: 150, one hundred and fifty
Q3.
What is 143 + 10?
133
144
Q4.
Use the number line representation to help you calculate 123 − 10
103