#  >> K-12 >> K-12 Basics

How to Round Up in Math

Rounding up helps make numbers easier to work with. For example, it's easier to add the rounded numbers 2,000 and 1,000 than the unrounded numbers 2,189 and 873. Rounding changes a number to an approximation of the original number. You can use rounding in situations that don't require exact accuracy. You can round numbers to any place value on the right or left side of the decimal place. A rounded number contains only zeros in the digits to the right of the rounded place value, or no digits to the right if the rounded place value is to the right of the decimal.

Instructions

    • 1

      Determine a number you want to round up. For example, round up the number 872.

    • 2

      Determine the place value to which you want to round up and the digit in that place value. For example, round up 872 to the hundreds place, which contains the digit 8.

    • 3

      Find the digit one place to the right of the place value to which you want to round up and check if it is 5 or greater to see if you can round up. In the example, the number 7 is in the tens place, which is one place to the right of the hundreds place, and it is greater than 5, so you can round up.

    • 4

      Increase the digit in the place value you want to round by 1. If the digit in the place value you're rounding up is 9, round the digit up to 10 by making that digit 0 and adding a 1 to the next digit to the left. In the example, increase the digit 8 in the hundreds place by 1, which equals 9.

    • 5

      Change all digits to the right of the rounded place value to 0. In the example, change the number 7 in the tens place and 2 in the ones place to 0. This results in 900 as the number 872 rounded up to the hundreds place.

Related articles
K-12 Basics
Latest Articles
Learnify Hub © www.0685.com All Rights Reserved