This tutorial looks at the errors made when adding or subtracting two digit numbers. Remedies are also provided so as to avoid the errors. Exercises are provided to reinforce the concepts taught.

A review worksheet on percentages, including expressing one quantity as a percentage of another quantity, percentage of a quantity and percentage increase/decrease. Answers to exercises included.

Revision worksheet on angle angles formed within parallel lines,angle properties of triangles, quadrilaterals and polygons and angles within circles.