Adding and subtracting fractions
If the denominators (the bottom numbers) are the same, we just need to add or subtract the numerators (the top numbers).
If the denominators (the bottom numbers) are different, we need to find the least common denominator. We can do this by following these steps:
Step 1: Convert fractions to have the same denominator (by multiplying):
Sometimes is better to divide one of the fractions:
And in some cases you have to multiply or divide both fractions:
If you are adding/subtracting fractions and whole numbers, you can turn the whole number into a fraction with the same denominator.