Number in Pictures Book 1 is the first book in the series, using pictures with supporting text, worked examples and review questions to cover multiples, factors, prime numbers, lowest common multiples, highest common factors and products of primes. Introducing fractions, adding, subtracting, multiplying and dividing fractions. Introducing decimals, and the four rules applied to decimals. Changing between fractions, decimals and percentages, examples using percentages including percentage increase, percentage decrease and percentage error.

There is a glossary. The review questions require iOS 10 or higher.