1. Adding and subtracting fractions with different denominators By NB

2. 3 +2

3. 6 + 3 =9 The denominators were different until the 2 was multiplied by 3. Each number in that is in that fraction. So now that they are the same it is not as hard. The 6 and 3 added together equal to 9. That is how I would do it.

4. 125 - 2

5. 125 - 105 The Denominator needed to be changed because it was not the same as the other one. If they are not the same it is not as simple to do the subtracting. So you need to change the denominator 25