(1) The number of missing shapes is not intuitive, and it is difficult to be nuanced.

(2) There is a hard way to "count" mountains, and there is no end to "learn" the sea.

(3) Go into the ocean of numbers and enjoy yourself.

(4) Addition, subtraction, multiplication and division are infinite; Parallel and vertical, enjoy it.

(5) 12345, there was a math contest.

(6) Create mathematics with thinking and let mathematics develop thinking.

(7) People who know mathematics are in good health, and those who know mathematics are the best in the world.

(8) Accurate calculation and ingenious solution of life equation; Ingenious design and careful drawing of life images.

(9) Write beautiful youth with algebra and outline wonderful life with geometry.

(10) Points, lines and polygons outline the world, and add, subtract, multiply and divide to deduce the infinite sky.