Rounding decimals
When rounding decimals, follow the three steps below:
Step #1:
Find the place you are rounding to. Is it the tenths, the hundredths, or the thousandths?
Step #2:
If the digit to the right of the place you are rounding to is 5 or more, add 1 to the place you are rounding to.
If it is less than 5, add nothing.
Step #3: drop all the digits to the right of the place you are rounding to.
Example #1:
Round 2.1582 to hundredths.
Step #1The place you are rounding to is the place the number 5 holds: 2.1
582
Step #2 The digit to the right of 5 is 8 and it is at least 5.
Therefore, we can add 1 to 5 to make it 6
Step #3
Drop 82 (all digits to the right of 5)
The answer is 2.16
Example #2:
Round 4.241 to tenths
Step #1The place you are rounding to is the place the number 2 holds: 4.
241
Step #2 The digit to the right of 2 is 4 and it is less than 5.
Therefore, we add nothing to 2
Step #3
Drop 41 (all digits to the right of 2)
The answer is 4.2
Other examples:
Round 5.18 to tenths
The answer is 5.2
Round 0.498 to hundredths
The answer is 0.50
Note that adding 1 to 9 gives 10. Write down 0 and put the 1 above 4; Finally add 1 to 4 to get 5. Go to adding decimals for more information.
Round 0.04 to tenths
The answer is 0.0
Note that we do not add anything to 0 because 4 is less than 5.
Rounding decimals quiz. Use the quiz below to test your knowledge.
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