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Addition and Subtraction: Mental Strategies

KS3 Numeracy Year 8
This unit is part of Around ARE Consolidating Numeracy

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Objectives

Day 1

  • Number bonds to 100: addition and subtraction; counting up.

KS3 Objectives

  • Use the four operations applied to integers.
  • Recognise and use relationships between operations including inverse operations.

Day 2

  • Mental addition of 2-digit numbers, including decimal numbers.

KS3 Objective

  • Use the four operations applied to integers and decimals.

Day 3

  • Mental subtraction of 2-digit numbers, including decimal numbers, by counting up.

KS3 Objective

  • Use the four operations applied to integers and decimals.

Lesson Planning

Day 1

Check-up

Use pairs to 100 (addition and subtraction).

Follow-up

Use the 1-100 grid to find complements to 100.

Day 2

Check-up

Use mental strategies to add pairs of 2-digit whole numbers and 2-digit numbers with one decimal place.

Follow-up

Focus on three different mental strategies to add pairs of 2-digit whole numbers and 2-digit numbers with one decimal place.

Day 3

Check-up

Use ‘counting up’ to subtract pairs of 2-digit whole numbers and 2-digit numbers with one decimal place.

Follow-up

Use ‘counting up’ on the number line to subtract pairs of 2-digit whole numbers and 2-digit numbers with one decimal place.

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