The series Mental Maths develops children's ability to understand number problems and to use their knowledge to resolve these problems confidently and logically. Mental Maths Book 2 covers: counting and ordering numbers to 100, patterns and sequences, counting money and calculating change, 2-D and 3-D shapes, tens and units; addition/subtraction of 2-digit numbers, time problems, estimating and measuring and multiples of 2/5/10.