Description: The number game is made of wood, safe and durable, no burrs, it is safe for kids to play. Help children to recognize numbers and learn by challenges. Number puzzle games exercise children's thinking ability, hand-on ability, and improve kid's concentration. How to play: Take out a card at random; Use blocks to make numbers according to the numbers on the card; Take out a question board, make a math question, and use blocks to spell out the answer. Perfect for kids boys girls as birthday gift. Size Chart: Reference Table: approx. 17x12cm / 6.69x4.72 inch Splicing Building Blocks Length: approx. 8.5cm / 3.35 inch Wood Board: approx. 27.5x23.2cm / 10.82x9.13 inch Package Includes: 20 Pieces Addition And Subtraction Reference Table 10 Pieces Assembling Reference Card 1 Piece Wood Board 14 Pieces Splicing Blocks Note: Please allow 1-3mm measuring deviation due to manual measurement. Due to the different monitor and light effect,the actual color of the item might be slightly different from the color showed on the pictures.Thank you!