Activities in this teaching pack include sets of differentiated cards to select and model how to add two digit numbers and tens using counting on when calculating the prices of decorations that might be added to a family Christmas tree.

The interactive presentation gets the children to explore how to use counting on to add two digit numbers and tens to calculate the prices of Christmas decorations.

This lesson is part of a maths scheme of work to get the children to practise using mental calculations and informal written calculations to add and subtract pairs of two digit numbers. There are teaching activities for shared learning, differentiated worksheets to support independent learning and interactive presentations to introduce concepts and key skills.