Adding fractions and Subtracting fractions with like denominators

Adding fractions and subtracting fractions with like denominators (bottom number) is easy, because all you have to do is add or subtract the numerators together (top number) . You only add or subtract the numerators because the denominators have the same number, which means they have the same number to make a whole. So you don't worry about adding the denominators. Lastly, if you fraction isn't in lowest terms (simplified) then make it in lowest terms. But how? Divide the fractions with it's biggest common multiple.

Example:

21/30 - 11/30 = 10/30 divided by 10 (biggest common multiple) = 1/3

Adding fractions & subtracting fractions (without lowest terms):

1/4 + 2/4 = 3/4    (1 + 2 = 3 --> then just put the denominator in the fraction.)
                                                                      ^ (3/4)
3/4 - 2/4 = 1/4    (3 - 2 = 1 --> then just put the denominator in the fraction.)
                                                                      ^ (1/4)

Adding & subtracting fractions(Like & unlike denominators)

Adding Alike: When adding fractions with the same denominators you add the numerators for example if it's 1/6 + 3/6 adding the numerators and keep the denominators 1+3=4 don`t add the denominator. Answer then is 4/6
Try these:  5/12 + 3/12  3/10 + 5/10

Adding Unalike: When adding fractions that have different denominators you have to determine a common denominator for example if it's 1/3 + 2/6 you can either multiply the 1/3 by 2 = 2/6 or multiply both fractions by the other fractions denominator 1/3x6=6/18 2/6x3=6/18 then add the numerators and keep the denominator
Try these: 3/12 + 2/6 5/10 + 2/5

Subtracting with Alike: When subtracting with alike you do the same thing for adding but subtract the 2 numbers for example if it's 8/10 - 3/10 do 8-3=5 so the answer is 5/10
Try these: 9/10 - 4/10  5/6 - 3/6

Subtracting with Unalike: When subtracting with unalike denominators you still have to find a common denominator like this: 6/10 - 2/5 you can either multiply that 2/5 by 2 and get 4/10 and subtract then answer is 2/10 or 6/10 x5 = 30/50 and 2/5x 10 = 20/50 and subtract then answer is 10/50
Try these: 7/12 - 3/6  7/8 - 1/4