Estimate a Sum by Rounding

Estimate Sum with Rounding: Learn

A quick way to estimate the sum of two numbers is to round each number and then add the rounded numbers. This probably won't be the exact answer but it may be close enough for some purposes.

How to Estimate a sum by rounding:

  • Round each term that will be added
  • Add the rounded numbers

Some uses of rounding:

  • Checking to see if you have enough money to buy what you want
  • Getting a rough idea of the correct answer to a problem

Estimating with Rounding: Practice

Estimate the sum by rounding the two numbers.


+ =

Press the Start Button To Begin

You have 0 correct and 0 incorrect.

This is 0 percent correct.


Game Name Description Best Score
How many correct answers can you get in 60 seconds? 0
Extra time is awarded for each correct answer.
Play longer by getting more correct.
How fast can you get 20 more correct answers than wrong answers? 999