A job. Most jobs will use these some time or another.
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Decimals: Blood alcohol level, making change, Fractions: Musical time signatures, slicing pizza. Converting a big recipe into a smaller recipe. Percent: Sales tax. Interest on credit cards.
You can use them for counting, which is in fact addition. You can also use them for subtracion. Integers are natural numbers. This means you don't use decimals or fractions.
Fractions or decimal fractions.
The answer will depend on which of the many properties of fractions you are referring to.
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