This workbook contains exercises that develop and improve children’s mental counting skills, ability to add and subtract vertically with regrouping, round numbers up to a hundred thousand places, get introduced to variables, and solve equations with variables. The workbook has a lot of fractions problems: add and subtract fractions, find equivalent fractions, find a fraction of a group. Children learn multiplication tables, solve money and word problems, find a perimeter and an area, work with coordinate planes. The workbook has a lot of exercises to boost problem-solving skills. In addition, some problems help to improve memory and logical thinking.