Double 2-digit numbers and record as multiplications where one of the factors is 2

I can double 2-digit numbers and record as multiplications where one of the factors is 2

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Year 2

Double 2-digit numbers and record as multiplications where one of the factors is 2

I can double 2-digit numbers and record as multiplications where one of the factors is 2

Download all resources

Share activities with pupils

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Lesson details

Key learning points

Doubles facts to 5 can help to double 2-digit numbers.
To double, partition the 2-digit number, double the ones digit then the tens digit and recombine.
Doubling can be written as a multiplication equation where one of the factors is 2
When one of the factors is 2, the product is double the other factor.

Keywords

Double/ Doubling - To become twice as many / to multiply by two.
Partition - The act of splitting an object or value down into smaller parts.
Factor - A factor is a number which exactly divides another whole number.
Product - A product is the result of two or more numbers multiplied together.

Common misconception

Children may not be able to see doubling where the numbers cannot be seen e.g. money contexts.

Children should be encouraged to represent the numbers using resources to support them in visualising the problem until they are confident to use mental strategies to solve.

Use of manipulatives are used within this lesson to visualise the process of doubling, but the aim is for children to work towards recalling these facts and strategies mentally.