Step 1:
![Number line: 0 through 100, with 2 black dots on 33 and 47.](https://s3.amazonaws.com/cms.accelerate-ed.com/image/d6c65609-de7e-429f-b341-28a06211ddac.png)
Find the addends on a number line.
Goal:
Goal:
Goal: Round the addends of an addition sentence.
We can help Elise by adding 32 + 47. 32 and 47 are big numbers. They are hard to add together. Let’s try rounding them to the nearest 10 instead.
Rounded addends make an estimated sum. The sum is not exact, but it is easy to find.
Rounding changes a number to help us add. Adding rounded addends makes an estimated sum.
Let’s add 32 + 47. Look at the real sum and the estimated sum.
Real Sum
Estimated Sum
The estimated sum is very close to the real sum. The rounded addends are whole tens. It is easier to find the estimated sum.
Sorry, that is not correct. The estimated sum is 110.
Sorry, that is not correct. The estimated sum is 110.
Great job! The estimated sum is 110.
Questions answered correctly:
Questions answered incorrectly: