Represent addition and subtraction of tens and ones with equations

I can represent the combining and partitioning of tens and ones with addition and subtraction equations.

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Year 2

Represent addition and subtraction of tens and ones with equations

I can represent the combining and partitioning of tens and ones with addition and subtraction equations.

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Share activities with pupils

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Lesson details

Key learning points

When tens and ones are combined to make a two-digit number, this can be represented it as an addition equation.
When a two-digit number is partitioned into tens and ones, this can be represented as a subtraction equation.

Common misconception

Children may fail to appreciate the importance of the equals sign in an equation, e.g. making errors such as 16 = 4 + 20, or confuse the value of the digits, making errors such as 43 = 4 + 30

Use the language of parts and whole to activate/link to prior learning. Encourage drawing of own part-part-whole models. Encourage children to spot errors and explain why they are are incorrect and to articulate their thinking around correct answers.

Keywords

Partition - To split a whole up into parts.
Combine - To put parts together to make a whole.
Part - A piece or section of a whole.
Whole - All of something; complete.

As previously, if children are making place value errors, return to practical equipment and the use of a number line. When representing numbers without practical equipment, ask children to prove with equipment or explain to a friend.

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).