This free year 3 maths worksheet has four number tracks to complete, practicing counting in steps of one up to and including numbers in the hundreds. Notice that the number tracks start at the bottom and go up, rather like the numbers on the vertical axis of a graph.
It is interesting to watch the way children tackle these. Probably the most efficient way, and the way to minimise mistakes, is to start at the highest number shown and continue counting up. Then return to the lowest number shown and count down.