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Year 3

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Year 3

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## Lesson details

### Key learning points

1. When using column addition, start by adding the numbers with the smallest place value first.
2. If the sum of the tens digits is ten or greater, regrouping is needed.
3. Any complete hundreds are regrouped into the hundreds column.

### Common misconception

Pupils may forget to add the 'regrouped' hundred when calculating the total for the hundreds column.

Model regrouping and finding column totals clearly, reminding pupils to add together all of the numbers in the column to get the total.

### Keywords

• Column addition - Column addition is a way of adding numbers by writing a number below another.

• Regroup - The process of unitising and exchanging between place values is known as regrouping.

Pupils may find base ten blocks helpful at the start of the lesson, especially for understanding the concept of regrouping. Reinforce the idea of starting by adding from the smallest place value first. We do this because of regrouping.
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.
How many tens are equal to 130?
3
10
130
Q2.
70 + 70 =
Correct Answer: 140, one hundred and forty
Q3.
Calculate the missing sum using column addition.
Q4.
Calculate the missing sum using column addition.
Correct Answer: 755, seven hundred and fifty-five
Q5.
What is the value of the digit 7 in this column addition?
Q6.
What number is missing from this column addition?

## Exit quiz

### 6 Questions

Q1.
150 can be regrouped into…
1 ten and 5 hundreds
1 ten and 50 ones
1 hundred and 5 ones
Correct answer: 1 hundred and 5 tens
Q2.
Match each tens numbers to the correct regrouping.
Correct Answer:240,2 hundreds and 4 tens

2 hundreds and 4 tens

Correct Answer:420,4 hundreds and 2 tens

4 hundreds and 2 tens

Correct Answer:440,4 hundreds and 4 tens

4 hundreds and 4 tens

Q3.
Calculate the missing sum.
217