Decode these simple problems, work out the answer and find the matching self-correcting puzzle piece. Both sets cover number problems that require the use of the four operations. Both sets cover number problems that require use of the four operations. The red phase set focuses on answers within 20, while the green phase progresses to problems that have answers within 100. There are 20 puzzles in each set and exciting activity instructions included on the box.

Suitable for ages 5+