Because integers can be written as fractions. Any number that can be written as a fraction is a rational number.
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Sometimes. Actually, very, very rarely.
All integers are rational numbers. There are integers with an i behind them that are imaginary numbers. They are not real numbers but they are rational. The square root of 2 is irrational. It is real but irrational.
Fractions are not integers. They may or may not be rational numbers.
All integers are rational. Not all rational numbers are integers.
Any 2 digit integers are rational numbers because all integers or whole numbers are rational numbers.