Activities in this teaching pack include a differentiated set of worksheets to identify whether a selection of addition calculations involving five digit numbers for support ability levels, six digit numbers for core ability levels and seven digit numbers for extension ability levels are true or false using the inverse operation of subtraction,

The interactive presentation gets the children to explore how to use standard subtraction written methods for decomposition to check different addition calculations,

This lesson is part of a maths scheme of work to get the children to use standard written methods of addition and subtraction to check calculated sums using inverse operations and solve problems with multi-step solutions. There are teaching activities for shared learning, differentiated worksheets to support independent learning and interactive presentations to introduce concepts and key skills.