Activities in this teaching pack include a set of differentiated worksheets to practise using addition written methods to check whether subtraction calculations are true or false when working with two digit numbers for support ability levels, three digit numbers for core ability levels and three and four digit numbers for extension ability levels.

The interactive presentation gets the children to explore and record how to check the answers to subtraction sums by using inverse addition calculations.

This lesson is part of a maths scheme of work to get the children to explain and model how to solve subtraction number problems by using addition sums as inverse operations for mental and written methods of calculations. There are teaching activities for shared learning, differentiated worksheets to support independent learning and interactive presentations to introduce concepts and key skills.