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

Share activities with pupils
Share function coming soon...

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).

Video

Loading...

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
Correct answer: 20
21
22
Q3.
Lucas is chanting his 5 times tables in descending order: 60, 55, 50, . What comes next?
Correct Answer: 45, forty-five, Forty-five
Q4.
Use short multiplication to calculate this question: 37 × 2 =
Correct Answer: 74, seventy-four, Seventy-four
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?
Correct Answer: 87, eighty-seven, Eighty-seven

6 Questions

Q1.
Select the correct short multiplication for this representation.
An image in a quiz
41 × 3
31 + 4
1 × 31
Correct answer: 4 × 31
Q2.
Select the correct short multiplication for this representation.
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
Q3.
Which short multiplication is correct for: 52 × 3 =
An image in a quiz
An image in a quiz
Correct Answer: An image in a quiz
An image in a quiz
Q4.
Look at the short multiplication. True or false: You will need to regroup in the 10s.
An image in a quiz
Correct answer: True
False
Q5.
The product is 205 which is the correct short multiplication?
Correct Answer: An image in a quiz
An image in a quiz
An image in a quiz
An image in a quiz
Q6.
Find the missing factor.
An image in a quiz
Correct Answer: 61, sixty one, Sixty-one