New
New
Year 5

# Multiply a 2-digit number by a 1-digit number using short multiplication (regrouping 1s to 10s)

I can use short multiplication to record regrouping from the 1s to the 10s.

New
New
Year 5

# Multiply a 2-digit number by a 1-digit number using short multiplication (regrouping 1s to 10s)

I can use short multiplication to record regrouping from the 1s to the 10s.

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## Lesson details

### Key learning points

1. If the product of the ones digit is greater than 10, you regroup ten ones into one ten.
2. Record the additional ten or tens as a small digit to be added in with the tens.
3. Short multiplication results in only one product being recorded.
4. There are similarities and differences between the expanded recording and short multiplication.

### Common misconception

Pupils may not align or regroup correctly leading to an inaccurate calculation.

Ask children about the additional ten or tens as a small digit to be added in with the tens. What does this show? What is the value?

### Keywords

• Short multiplication - A method using columns to set out and calculate a multiplication is short multiplication.

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

Ensure pupils can generalise short multiplication results in only one product being recorded. Allow lots of opportunities for pupils to practise the layout and set up of the strategy.
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.
Jacob is chanting his 7 times tables: 7, 14, 21, 28, ___ What comes next?
34
42
43
Q2.
Aisha is chanting her 9 times tables: 9, 18, 27, What comes next?
Correct Answer: 36, 3 6 , Thirty - six, thirty - six, thirty-six
Q3.
Look at the multiplication equation: 82 × 2. When multiplying in the ones column this will give us a ___ digit partial product.
2
3
Q4.
Use short multiplication to calculate this question: 42 × 2 =
Q5.
Calculate and sort the multiplication equations into descending order.
1 - 4 × 21
2 - 22 × 3
3 - 2 × 24
4 - 0 × 25
Q6.
The product is 2 digits. 3 and 11 are two of my many factors. This number is also a multiple of 9. What number could it be?
Correct Answer: 99, ninety-nine, ninety nine

## Exit quiz

### 6 Questions

Q1.
The answer when two or more values are multiplied together is known as the __________.
factor
partial product
Q2.
Complete the sentence 3 × 6 ones is 18 ones. 18 is made up of 1 ten and 8 ones. I will regroup 1 ten and place it underneath the column.
ones column
hundreds column
Q3.
I have regrouped tens.
Correct Answer: 2, two, Two, two tens
Q4.
The multiplication is: 27 × 2 Which short multiplication shows this correctly?