Looking vertically, it is the same from top to bottom. Looking sideways, it decreases from left to right. Looking sideways, it increases from left to right. Vertically, the minuend is equal to the minuend, and the previous number is one more than the next.

For addition tables within 10, the horizontal and vertical viewing rules are as follows:

Looking horizontally at the addition table where 1 is less than 10, the result of each row is a number, and the result from top to bottom changes from small to large, with a change gradient of 1.

2. Looking vertically at the addition table within 10 minutes, the smallest number is the largest, and the bottom result is one bigger than the last one. Each layer is the result of this layer, which is larger than the previous layer 1.

Introduction to mathematics:

Mathematics, often abbreviated as Math or maths, is a subject that studies concepts such as quantity, structure, change, space and information. Mathematics is a universal means for human beings to strictly describe the abstract structure and mode of things, and can be applied to any problem in the real world.

All mathematical objects are artificially defined in essence. In this sense, mathematics belongs to formal science, not natural science. Different mathematicians and philosophers have a series of views on the exact scope and definition of mathematics.