How to Round One Decimal Place
When a number is not a round number, a decimal is inserted to indicate the portion of the partial number. For example, one and five-tenths numerically, or one and one-half, is written as 1.5. When dealing with decimals, it is not uncommon to have a long number following the decimal point. In many instances, you will want to round this number down to one or two decimal places for practical purposes and to make the number more manageable. Rounding numbers is a quick process, as long as you understand the rules.
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Instructions
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1
Look last number to the right of the decimal. For example, in the number 2.2553, 3 is the last number to the right of the decimal.
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Add one to the number immediately to the last number's left if the last number to the right of the decimal is a 5, 6, 7, 8 or 9. Do not change the number immediately to the last number's left if the last number to the right of the decimal is a 0, 1, 2, 3 or 4. For example, because the last number in 2.2553 is 3, you do not change the number to its left, which in this example is 5.
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3
Remove the last number to the right of the decimal from the number. Upon dropping the 3, the new number becomes 2.255.
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4
Repeat these steps until only one decimal place remains. For example, 2.255 rounds to 2.26, which then rounds to 2.3.
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Tips & Warnings
If the number being increased is a 9, it becomes a 0 and you must add 1 to its left. For example, 3.957 rounds to 3.96, which then rounds to 4.0.
