This is a set of cards for solving arithmetic problems. ● An item that allows you to study addition and subtraction in the bath! ● The answers are written on the back of the problems. ■Specifications■ Target age: 6 years and older Contents: Addition cards x 90, Subtraction cards x 90 I bought it, but I never used it. It's in beautiful condition, with no stains or missing cards. It's waterproof, so you can use it in the bath, and you can learn while leisurely flipping through the calculation cards while soaking in the tub! It's easy to carry, so it's recommended! - Contents: Arithmetic problem cards - Quantity: Multiple cards - Design: Gray printing on a white background - Purpose: For calculation practice Thank you for looking.