Key learning points

1. It is difficult to know what a digit represents if you do not know its place value.
2. An integer can be written as the sum of the place value of its digits.
3. Rearranging the digits in an integer can alter its overall value.

Common misconception

Keywords

• Digit - A digit is one of the symbols of a number system. In our number system we use the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.

• Integer - An integer is any positive or negative whole number or zero. E.g. -2, 0, 153 are all examples of integers.