We very often encounter fractional amounts of things, in real life. Your coffee costs a dollar and a half. You buy a pound and a quarter of cashew nuts. You and your two friends eat out together and you split the bill in thirds. And so forth.
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In calculating fractions.
yes because if there were no fractions there will be nothing.
You are asked to put the fractions on a number line to help you understand fractions. It isn't so much you will use a number line " in real life" but it gives you a visual representation to help you learn. You will use fractions for many things in life. Just do what what you are asked to do by your teacher they have a reason. You are not the only student in the class and others may need a bit extra assignments to help them understand. Go with the flow. Not all things in life will relate to "real life."
Fractions are used in recipe... For eg:1/4tsp sugar
We use fractions in the grocery we use fractions in the grocery shops like half a dozen