Lesson Five – Number Reverses
This maths teaching pack for Key Stage Two gets the children to practise using inverse operations to check the addition and subtraction sums for different number calculations.
The class can identify and explain when they might choose to use mental or written methods to complete an addition or subtraction calculation as an inverse operation.
Download this teaching pack including a lesson plan, classroom activities and an interactive presentation to teach the children to practise using inverse operations to check the addition and subtraction sums for different number calculations
Activities in this teaching pack include a set of differentiated worksheets to select and record inverse operations that can be used to check the sums of addition and subtraction calculations. The class can identify when to choose mental or written calculations to complete each inverse operation sum.
The interactive presentation gets the children to explain how to check the sums of addition calculation using subtraction and vice-versa and how to choose the best calculation to complete each sum.
This lesson is part of a maths scheme of work to get the children to identify and model how to solve contextual problems using formal written calculations for addition and subtraction including exchange between place value. There are teaching activities for shared learning, differentiated worksheets to support independent learning and interactive presentations to introduce concepts and key skills.
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Ordering and Changing
Explore and record how to order three digit numbers by the place value of their digits and how the digits in a number change their numerical values when finding ten and one hundred more or less
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Changing Hundreds
Explore and record the matching number sums that are one hundred more and less than different three digit numbers to show changes to the place values of their numerical digits
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Digit Changes
Identify and record the matching number sums that are ten less than different three digit numbers by illustrating changes to the values of their hundreds, tens and ones digits
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Changing Numbers
Identify and record number sums that are ten more than different three digit numbers using abacus diagrams to model their changing values