take for example
Such as 8 and 1, 8 and 7.
8- 1=7
8-7= 1
Obviously, the number 7 is relatively large, and 1 is relatively small.
So 8 is much more than 1, and 8 is only a little more than 7.
Extended data
Multiplication is a simple operation of addition and division is a simple operation of subtraction.
Subtraction and addition are reciprocal operations, and division and multiplication are reciprocal operations.
Integer addition and subtraction algorithm;
(1) Same-digit alignment;
(2) from the unit;
(3) When it is added to dozens, it will be pushed to a higher position; If the subtraction is not enough, subtract 1 from the high position. When this number is added to 10, it will decrease.
Properties of addition operation
From additive commutative law's associative law, it can be concluded that when several addends are added, the positions of addends can be exchanged at will; Or add a few addends first and then add them with other addends, and the sum remains the same. For example: 34+72+66+28 = (34+66)+(72+28) = 200.