Suppose you were asked to multiply 25 and 63. If you’re like most people, you’d probably reach for a calculator. But if you couldn’t find one, you’d probably use the standard algorithm ... example, ...

Find out what multiples are and how to sort multiples of 2 and 5. Doubling numbers Learn how to make doubles using ten frames, addition and multiplication. Counting in twos, threes, fives and tens ...