Strategies and process skills to develop mental calculation Learn to do these MENTALLY! Adding and subtracting up to 6-digit Numbers Multiplying and dividing up to 4-digit Numbers Adding and Subtracting unlike Fractions Multiplying and Dividing Fractions Calculating Percentage Squaring Numbers Adding a series of Numbers 52 Practice & Revision Papers (1 a week!) for effective mental workout Over 500 Questions to sharpen mental arithmetic Answers provided for quick self-assessment.