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
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
Lesson details
Key learning points
- If the product of the single digit and the tens number is greater than 100 then you regroup ten tens into one hundred.
- Record the additional hundred or hundreds in the hundreds column, one column to the left of the tens digits.
- Short multiplication results in only one product being recorded.
- 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.
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...
Starter quiz
6 Questions
Exit quiz
6 Questions
