When rounding decimals, follow the three steps below:
Find the place you are rounding to. Is it the tenths, the hundredths, or the thousandths?
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.
drop all the digits to the right of the place you are rounding to.
Round 2.1582 to hundredths.
The place you are rounding to is the place the number 5 holds: 2.15
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
Drop 82 (all digits to the right of 5)
The answer is 2.16
Round 4.241 to tenths
The place you are rounding to is the place the number 2 holds: 4.2
The digit to the right of 2 is 4 and it is less than 5.
Therefore, we add nothing to 2
Drop 41 (all digits to the right of 2)
The answer is 4.2
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.
Oct 15, 18 11:05 AM
why the rule of 72 works- math explanation of where the 72 came from.
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