The general rule for estimating is to look at the digit to the right of the digit you want to estimate. Estimating or rounding to the nearest whole number means looking at the digit to the right of the decimal. If you see a digit greater than 5, round up, and if it's less than 5, round down.
How do you estimate example?
Example:
- 550 + 298: 298 is nearly 300 so an estimate is 550+300 = 850.
- 550 + 248: 50+48 is nearly 100 so an estimate is 500+200 +100 = 800.
How do you estimate in math?
To get an estimate of the sum, round off all the numbers to the same place value, then add them. To estimate the difference, round off all the numbers to the same place value, then subtract them accordingly.
