New
New
Year 5

# Multiply a 2-digit number by a 1-digit number using short multiplication (regrouping 10s to 100s)

I can use short multiplication to record regrouping from the 10s to the 100s

New
New
Year 5

# Multiply a 2-digit number by a 1-digit number using short multiplication (regrouping 10s to 100s)

I can use short multiplication to record regrouping from the 10s to the 100s

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## Lesson details

### Key learning points

1. If the product of the single digit and the tens number is greater than 100 then you regroup ten tens into one hundred.
2. Record the additional hundred or hundreds in the hundreds column, one column to the left of the tens digits.
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.

Reiterate that if the product of the single digit and the tens number is greater than 100 then you regroup ten tens into one hundred.

### Keywords

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

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

Ensure children can record the additional hundred or hundreds in the hundreds column, one column to the left of the tens digits. Allow lots of opportunities for independent recording.
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.
630 can be partitioned as __________.
6 tens and 3 tens
6 hundreds and 0 ten
Correct answer: 6 hundreds and 3 tens
6 hundreds and 30 tens
Q2.
Lucas is chanting his 5 times tables: 5, 10, 15, ___. What comes next?
19
21
22
Q3.
Lucas is chanting his 5 times tables in descending order: 60, 55, 50, . What comes next?
Q4.
Use short multiplication to calculate this question: 37 × 2 =
Q5.
Calculate and sort the multiplication equations into descending order.
1 - 4 × 44
2 - 45 × 3
3 - 44 × 3
4 - 0 × 46
Q6.
Use short multiplication to solve this question: Jacob has 29 packets of sweets. Each packet has 3 sweets. How many sweets does her have altogether?

## Exit quiz

### 6 Questions

Q1.
Select the correct short multiplication for this representation.
41 × 3
31 + 4
1 × 31
Q2.
Select the correct short multiplication for this representation.
Correct Answer: An image in a quiz
Q3.
Which short multiplication is correct for: 52 × 3 =
Correct Answer: An image in a quiz
Q4.
Look at the short multiplication. True or false: You will need to regroup in the 10s.