There are many ways to teach numbers to kids. Abacus is a great tool to teach your child simple math such as counting, addition, subtraction, multiplication, and even division. This is a combo pack of “A & B” books of Level-3, which contains Plus and Minus of triple-digit numbers and multiplication of two-digit numbers with a single digit. Mental Maths is also there. It helps in the whole brain development of a child. These Books are very attractive and are of very good quality. These books are suitable for those students only, who have completed the first 2 Levels of Abacus education.