This game presents addition problems using numbers up to 15. Incomplete addition problems appear at the top of the screen, above a number line formed of people wearing numbered shirts. Children indicate the correct answer by clicking on the appropriately numbered shirt. If the answer is correct the toad will jump to that shirt. Use the game as a group activity, encouraging children to share and discuss ideas before selecting a response. Develop estimation skills, by inviting children to predict the approximate answer to the problems, before using the number line to check.