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Jan06

Estimations: Rounding Decimals to The Nearest Whole Number

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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.

Rounding Decimals

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

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10 Comments

  • Ify OkekeOct 08 2019, 5:11 PM

    Thanks! It’s cool

    Reply
  • KeannaSep 30 2019, 5:32 PM

    I love it because it help me a lot

    Reply
  • LujaynaOct 18 2018, 11:42 AM

    I think this app really helps me a lot !!!!!

    Reply
  • SariahSep 19 2018, 9:58 AM

    I think this is great for everybody who wants to learn.

    Reply
  • Raeness LantayaAug 24 2017, 10:10 PM

    What if the number after the decimal is 0? What do we do?

    Reply
    • Raeness LantayaAug 24 2017, 10:12 PM

      Nevermind I got it. Thank you so much! I understand now 🙂

      Reply
      • SmartickSep 06 2017, 2:21 AM

        Great!

        Reply
    • Vanessa ShwartsFeb 06 2019, 12:59 PM

      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.

      Reply
    • joelNov 06 2019, 8:12 AM

      you just have to keep the same number suppose your question is 20.0 the answer is 20

      Reply
  • minkailuJul 23 2017, 8:26 AM

    thanks could solve a problem for me

    Reply