Main content

# Understand decimals: FAQ

Frequently asked questions about decimal fractions.

## What's the difference between a fraction and a decimal?

A fraction is a way of expressing a part of a whole, using two numbers separated by a slash. For example, $\frac{1}{2}$ means "one half." A decimal is another way of expressing a part of a whole, using a decimal point. For example, $0.5$ also means "one half."

Try it yourself with these exercises:

## Why are grids and number lines helpful for understanding decimals and fractions?

Grids and number lines can help us visualize decimals and fractions, which can make them easier to understand. By seeing how they're laid out, we can better compare them and see how they relate to one another.

Try it yourself with these exercises:

## How do we write fractions as a decimals and decimals as fractions?

To write a fraction as a decimal, divide the top number (the numerator) by the bottom number (the denominator). For example, $\frac{3}{4}$ can be written as $0.75$ .

To write a decimal as a fraction, count the number of places after the decimal point. Write the decimal as the numerator, and put a 1 as the denominator, followed by as many zeroes as there are places after the decimal point. For example, $0.37$ can be written as $\frac{37}{100}$ .

Try it yourself with these exercises:

## How do I compare two decimals?

To compare two decimals, we can look at the whole numbers before the decimal point. If one of these is larger, we know that number is larger overall. If the whole numbers are the same, we can compare the decimal digits, starting on the left. In cases where one decimal has more digits than the other, you can add zeroes to the end of the shorter decimal to make the comparison easier.

Try it yourself with these exercises:

## Where do we use decimals and fractions in the real world?

Decimals and fractions are used all over the place! For example, they're used in cooking and baking (i.e. $\frac{1}{2}$ teaspoon), in sports (i.e. batting average of $0.250$ ), and in finance (i.e. a $2.5\mathrm{\%}$ interest rate).

## Want to join the conversation?

- Is 45/100 = to 0.45?(10 votes)
- Yes you are correct(5 votes)

- in decimals is 0.5 equal to 1 half?(4 votes)
- Yes. If you bisect 1 into 2 "pieces", they each will be 0.5.(2 votes)

- I do not undrestand(4 votes)
- Why are decimals important(2 votes)
- It can be used to represent numbers that aren't an integer easily in daily life.(3 votes)

- how do express this 346.5442/34944870(3 votes)
- How do you do decimal I am in third grade(3 votes)
- I think Khans making me wrong with mostly everything(2 votes)
- Yes,
`2 - 0.5 = 1.5`

, just as`20 tenths - 5 tenths = 15 tenths`

.(1 vote)

- When you are doing decimals on a grid, do you add the 2 zeros from the "__/100" to your decimal? Like say your fraction is 39/100. Is your decimal .3900 or .390 or just .39??(2 votes)
- 0.39 because you do not need to add the 0 in a decimal.(1 vote)

- 2/10 can be 0.2 because 2/10 is not a whole(2 votes)