The series "Let's Learn Basic of Numbers" is easy to learn Calculation and Mental Math Skill program which can help your child to master the Calculation and Mental Math Skills. These workbooks help students to growth and deeper conceptual understanding of number fundamentals. This workbook reinforces basic concept of subtraction with gradually increasing difficulty level. Different activities are included to make this the perfect supplement for fundamental of numercy. It may prove a great resource for early Maths learners, and students who need an extra boost to learn Number Concepts and develop mental maths skills.