The focus of the Prerequisite check (page 1) is to ensure that children are fluent in counting to 10. Initially, ask children to count to 10 while pointing to each of the counters on the ten frame, starting at the top left. Then cover the ten frame and count to 10 together. Repeat, missing some of the numbers so that children can fill in the gaps.
The Stimulus (page 2) introduces the concept of games involving jumping from one number to the next, going forwards in sequence, and shows a version of a number track.