Answer:
1 + 1/10
1 + 13/20
9/24 + 16/24
24/30 - 5/30
Explanation:
For part 1:
2+7/10 - 1+6/10: 2-1 = 1, and 7/10 - 6/10 = 1/10, so the answer is 1+1/10
For the rest, change the fractions so that they have the same number on the bottom (equivalent denominators).
Here's an example:
If you were asked to solve: 1/3 + 2/4, you would multiple the top and bottom of the first fraction by 4 and multiply the top and bottom of the second fraction by 3. This would leave you with equal denominators in both fractions.
(1*4)/(3*4) + (2*3)/(4*3) = 4/12 + 6/12 = 10/12 which can be simplified to 5/6. Simplifying fractions can be done by diving both the top and bottom by the same number (in this case it was 2).