One of 14 great puzzles. Mark your students' math homework, as fast as possible. Download now!

This puzzle is inspired by the countdown numbers game. You play the role of a math teacher, and you need to work out whether the sums that they've done are right or not. Unfortunately for you, your students aren't very good, and they've made lots of mistakes. While students might be allowed to make mistakes, teachers aren't - so you have to be careful! The faster you finish a level, the higher your score; but make one slip up, and its all over.

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