Remember: To find all the factor pairs, it is not necessary to draw every rectangle. Eg, a 5 x 2 rectangle and a 2 x 5 rectangle are the same rectangle in a different orientation. Only one of ...

The first factor pair is always 1 and the number itself. Consider whether the number is divisible, in turn, by 2, 3, 4, etc. Divide to find the other factor of the pair. All the factors are found ...