well you use them for math
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Everywhere, you say I want one apple, or twocookies; both rational numbers.
Never. When you dont add the same odd number and even number of times. For example: 5 + 3 (2 odd numbers; and even amount of odd numbers ) = 8 5 + 3 + 7 = 15 an odd amount of odd numbers 5 + 3 + 7 + 9 = 24 another even amount of odd numbers. But never if you use the only same number
In finding the LCM or HCF of two or more numbers
When working with really large or really small numbers.