Estimating is one of the most easiest things you do in math because all you are doing is just making a reasonable guess of what the answer can be. Just keep some of these key points in your mind for this topic:
- Sum is the answer to an addition problem
- Difference is the answer to a subtraction problem
- Estimation is making a reasonable guess
- Fractions must have a numerator and a denominator
Let's Try It Out!
Let's say that we have a problem such as 3/12 plus 2/6. All you need to do is figure out whether the fraction is close to 0, 1/2, or 1. In this case we have the following:
3/12 is closer to 0
2/6 is closer to 1/2
That means that all we do now is add our estimated fractions together: 1/2+0 which equals 1/2.
Therefore, our estimated sum for 3/12+2/6=1/2
To check your estimate, you can always do the actual problem and compare to see whether they're reasonable.
If you are having trouble figuring out whether to round to 0, 1/2, or 1, then I suggest using a number line, like the following:
Sheet 1 Practice Problems on Adding and Subtracting Fractions