Activities in this teaching pack include a set of differentiated worksheets to record how to complete a two step number problem using mental and formal written methods to subtract a pair of numbers. The class use counting on and back to complete the mental step in the calculation and decomposition for the written step.

The interactive presentation gets the children to identify and describe the calculation steps that can be used when solving a number problem using a formal method of subtraction with exchange between place value.

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.