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 the “A” book of Level-7. Other than the topics of Plus/Minus/ Multiplication/ Division/Square/BODMAS which were covered in Level-6, this level contains DECIMALS and percentage (%) also. It contains multiplication of triple-digit multiplicand with a double as well as a triple-digit multiplier. BODMAS formulae have been explained in detail here.