Explain how to use long multiplication to multiply a 4-digit by a 2-digit number
I can explain how to use long multiplication to multiply a 4-digit by a 2-digit number.
Explain how to use long multiplication to multiply a 4-digit by a 2-digit number
I can explain how to use long multiplication to multiply a 4-digit by a 2-digit number.
Lesson details
Key learning points
- Calculate the partial products.
- Add the partial products to recombine.
- Regroup when numbers bridge 10, 100, 1,000, 10,000
Keywords
Partial product - Any of the multiplication results we get leading up to an overall multiplication result is a partial product.
Regroup - The process of unitising and exchanging between place values is known as regrouping.
Common misconception
Pupils find it challenging to keep track of multiple regroupings in the long multiplication layout and therefore forget to add these to partial products.
Estimation can support checking of magnitude. Discuss and agree on a position for regrouped values and continuously model noting and using these.
Equipment
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).
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