New
New
Year 3

New
New
Year 3

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## Lesson details

### Key learning points

1. Start with the ones column so that regrouping can be represented
2. If the sum of the ones digits is ten or greater, regrouping is needed
3. Any complete tens are regrouped into the tens column

### Common misconception

Pupils may regroup incorrectly, forget to write the regrouped ten or forget to add any regrouped tens when calculating the total for the tens column.

Emphasise that the regrouped number is a ten and that it needs to be added to the tens total. If necessary, revisit the use of base ten blocks.

### Keywords

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

• Regroup - Regroup means moving an amount to make a calculation easier.

Pupils may find base ten blocks helpful, particularly at the start of the session. Ensure that pupils understand regrouping before moving on to introduce the more abstract version of the column addition algorithm.
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.
Calculate the missing sum.
Q2.
Calculate the missing number in the column addition.
Q3.
Calculate the missing sum.
533
531
432
Q4.
Find the value of the missing digit in the column addition.
Q5.
Q6.
Correct Answer: 234, two hundred and thirty-four

## Exit quiz

### 6 Questions

Q1.
13 can be regrouped into…
1 ten and 5 ones
3 tens and 1 one
Correct answer: 1 ten and 3 ones
Q2.
Match each ones numbers to the correct regrouping.
Correct Answer:11 ,1 ten and 1 one

1 ten and 1 one

Correct Answer:14,1 ten and 4 ones

1 ten and 4 ones

Correct Answer:41,4 tens and 1 one

4 tens and 1 one

Correct Answer:44,4 tens and 4 ones

4 tens and 4 ones

Q3.
Calculate the missing sum.