The game is an effective way to strengthen the mastery of the composition of 11-20 numbers. The 10 chessboards in the box refer to the composition of 11-20 numbers, including examples of addition and subtraction, both with and without the transition. In the box you will also find a poster containing 11-20 numbers using sum expressions, which can be used to check the accuracy of the actions performed during the game. \`Mathematical basketball\` game is colorful, stimulating, captivates the child with its basketball images:
developing the latter\'s imaginary world. The game can be played in at least 2 group and 2 individual versions.