This eBook introduces the subjects of addition and subtraction and its practice, numbers from 0 to 999, place value, number lines, counting on and back in 1s, 2s, 3s, 5s and 10s, counting sequences and patterns, addition, subtraction, number machines, number facts, number bonds, what’s the difference, adding three numbers and working with money. This eBook is part of our range of Grades 1 & 2 math eBooks that are fully aligned with the North American math curriculum. These eBooks comprise two principle sections, notably: •Number •Shape, Space and Measures The Number principle section has three individual modules. They are: •Counting Practice •Addition and Subtraction Practice •Multiplication and Division Practice The Shape, Space and Measures eBook is a principle publication, without any separate modules. As well as the above eBooks there is a Grades 1 & 2 Publications Guide eBook, a Grades 1 & 2 Times Table Practice eBook, a Grades 1 7 2 Mental Math eBook and a combined Grades 1 & 2 and Grades 3, 4 & 5 Times Table Practice eBook.