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 ...

Counting on and back to 20 Learn on how to count on and back from 0 to 20. Comparing numbers within 20 Find out how to compare numbers 1 - 20, using number lines and symbols. Odd and even numbers ...