When you count to 20, you start at 1 (or zero) and count on until you reach 20. Each number is one more than the last. When you count back from 20, you start at 20 and count back until you reach 1 ...

Numbers to 20 Learn on how to count on and back from 0 to 20. Compare and order numbers within 20 Find out how to order the numbers 1 - 20, using strawberries, books and numbers.