This mental math game is suitable for pupils who start learning numbers up to 20.

Kids have to subtract the number 1 from numbers 1-20. There is 2 set of 20 questions and 2 jigsaw puzzle.

This mental game can be played several times because the questions are never the same.

Motivation to solve subtraction questions is increased because of the hidden picture. Each correct answer reveals a piece of it.

The teacher only has to look at how much of the picture each student has uncovered to know how well the students are doing in solving the problems.