Rounding means replacing a number with an approximate number that is simpler than the previous one.
To round a number to a particular place, we need to check the digit to the immediate right of that place. If the digit is 5 or greater than 5, the digit at the required place is incremented by 1. If not, the digit remains the same and all the digits to the right of that digit are replaced with zeroes.
The following are the steps you should follow while rounding:
Estimate 2314 + 1231. Round to the nearest tens when estimating.
Upon rounding off the numbers 2314 & 1231 to the nearest tens, we get
Hence, the estimated sum is 3540.
Estimate 4237 – 1532 Round to the nearest hundreds when estimating.
Upon rounding off the numbers 4237 & 1532 to the nearest hundreds, we get
Hence, the estimated difference is 2700.
Estimate 23162 – 12524. Round to nearest tens, thousands, and ten thousands to estimate in three ways.
Upon rounding off the given numbers to nearest tens, we get
Upon rounding off the given numbers to nearest thousands, we get
Upon rounding off the given numbers to the nearest ten-thousands, we get
Estimate the sum,
17281 + 12754. Round to nearest hundreds and ten-thousands to estimate.
Upon rounding of the given numbers according to the place values, we get
17281\(\rightarrow \)17300 (Nearest hundredths)
12754\(\rightarrow \)12800 (Nearest hundredths)
Daisy has walked 210 yards more than Noah. If Noah has walked a total of 1520 yards, approximately how much has Daisy walked in total?
We need to find an approximate value. Hence, we can estimate. Let us estimate to the nearest hundreds.
Noah has walked for 1520 yard
Daisy has walked for (1520 + 210) yard
Upon rounding off the distances to the nearest ten, we get
(1500 + 200) = 1700
Hence, Daisy has walked approximately 1700 yards.
It affects the accuracy of the estimate, as the value of the place to which the digit is rounded to increases, the accuracy of the estimate decreases.
For ease and speed of calculations, numbers can be rounded in a manner that the sum or difference can be easily estimated.