Counting to 20
Forwards and backwards along the line
Let’s count all the way to 20 — and back down again! Use the number line to help.
01234567891011121314151617181920
Count forwards: 0, 1, 2 … up to 20. Count backwards: 20, 19, 18 … down to 0. Each step forward is one more; each step back is one less.