As shown in the figure, the original three triangles and five identical triangles are used. Through addition calculation, the total * * * is 3+5=8.
Add:
Refers to the calculation of combining two or more numbers and quantities into one number and quantity. The symbol of addition is the plus sign "+". Connect items with a plus sign when adding.
Addition (usually indicated by the plus sign "+") is one of the four basic arithmetic operations, and the others are subtraction, multiplication and division.
For example, in the picture above, * * * has a combination of three triangles and five triangles, and * * * counts as eight triangles. This observation is equivalent to the mathematical expression "3+5 = 8", that is, "3 plus 5 equals 8".
The essence of addition:
It is exactly the same thing, that is, the repetition or accumulation of similar things, which is the beginning of numerical operation. Different kinds, such as an apple and an orange, can only be equal to two fruits, so there is a relationship between classification and classification.
Subtraction is the inverse operation of addition, multiplication is a special form of addition, division is the inverse operation of multiplication, power is the simple form of multiplication, root is the inverse operation of power, and logarithm is the law in the form of power. Derivative is developed from logarithm, then differential and integral. The development of digital operation is a more special situation and a more repetitive law.