Rounding decimals to the nearest whole number or the tenths, hundredths, thousandths is easy!
In this post, we are going to learn to round decimal numbers. Rounding decimals helps us to manage the numbers more easily in order to operate them.
Rounding decimals to the nearest whole number
To round a number to the nearest whole number, you have to look at the first digit after the decimal point.
If this digit is less than 5 (1, 2, 3, 4) we don’t have to do anything, but if the digit is 5 or greater (5, 6, 7, 8, 9) we must round up.
Examples:
- Round the following number to the nearest whole: 5.36
We notice the digit after the decimal point is 3. Since it is less than 5, the number is closer to 5 than to 6, and so the rounded whole number is 5.
- Round the following number to the nearest whole unit: 32.74
We notice the digit after the decimal point is 7. Since it is greater than 5, the number is closer to 33 than to 32. The rounded whole number is 33.
Rounding decimals to the tenths, hundredths, thousandths…
To round a decimal number we have to look at the number after the one we want to round to. If we have to round to the nearest tenth, we focus on the digit in the hundredths place. If we have to round to the nearest hundredth, we focus on the digit in the thousandths place. If this digit is less than 5 (1, 2, 3, 4) we don’t have to do anything, but if it is 5 or greater (5, 6, 7, 8, 9), we must round up.
Examples:
- Round the following number to the nearest tenth: 10.386
We focus on the digit after the tenths place (in the hundredths place), which is 8. Since 8 is greater than 5 we have to round up in the tenths place. The rounded number is 10.4, which means that 10.388 is closer to 10.4 than to 10.3
- Round the following number to the nearest hundredth: 0.4838
We focus on the digit after the hundredths place (in the thousandths place), which is 3. Since it is less than 5, we don’t change the digit in the hundredths place. The rounded number is 0.48. Which means that 0.4838 is closer to 0.48 than to 0.49
If you liked this post and want to learn more elementary math, try Smartick for free.
Learn More:
- What Are Decimal Numbers?
- Learn How to Estimate Sums with Some Examples
- Working with Decimals: Addition and Subtraction
- Learn How to Estimate a Sum with Examples
- Round and Estimate Subtraction Problems
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I really understand, thankyou so much!
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Great work well explained!
Is 4328.418 rounded to 2 significant figures 4328.42
Yes! And rounded to a whole number it would be 4328
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what is 17.3 rounded to the nearest whole number
17
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6021.62
Nearest whole number
6022
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what is 251.2 rounded to the nearest whole number
251
what is 9.204 rounded to the nearest whole number
9
Round 984759.995148 to the nearest whole number
984760
What does 1.47 round to the nearest whole number
1
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What if the number after the decimal is 0? What do we do?
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Great!
If the number after the decimal is zero, than it is already a whole number unless there is a number after the zero different than zero.
you just have to keep the same number suppose your question is 20.0 the answer is 20
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