Activities in this teaching pack include differentiated worksheets to model how to use an abacus to record number sums that are one more and one less than different one digit numbers for support ability levels, one and two digit numbers for core ability levels and two digit numbers for extension ability levels.

The interactive presentation gets the children to explore how to use an abacus to count and illustrate different sets of numbers that make sums to twenty.

This lesson is part of a maths scheme of work to get the children to explore how to model and illustrate ways of counting different numbers of objects and pictures with matching sums to twenty. There are teaching activities for shared learning, differentiated worksheets to support independent learning and interactive presentations to introduce concepts and key skills.