Integers are whole numbers without decimals or fractions which are useful because calculations are easier to work out.
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Because otherwise you would only know how to subtract and add with the same integers. Not a particularly useful skill unless just those integers turned up!
When you can do addition and subtraction without recourse to it. Then it simply becomes a distraction.
Any fraction can go into any other fraction. The concept of "going into" for a limited set of numbers is useful only for integers.
2436 and 1624 are integers, not fractions. And, as integers, they are unequal.2436 and 1624 are integers, not fractions. And, as integers, they are unequal.2436 and 1624 are integers, not fractions. And, as integers, they are unequal.2436 and 1624 are integers, not fractions. And, as integers, they are unequal.
The set of integers is divided into three subsets. One is the positive integers. Another is the negative integers. The last subset has one element -- zero. In sum, integers are composed of the positive integers, the negative integers, and zero.