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(3/4) + (7/12):

you need to have both denominators the same, before you can add the numerators.

the LCD is 12, if you multiply (3/4) by 1, then it's value does not change.

Three-thirds (3/3) is equal to 1, so

3 3

-*- = (3*3) {multiply the numerators}/ (4*3) {multiply the denominators}= 9/12

4 3

so replace (3/4) above with (9/12) since they have the same value, and:

(9/12) + (7/12) =

9 + 7

------- = 16/12

12

This simplifies to 4/3, which is an improper fraction.

Think of it as (3 + 1)/3 = (3/3) + 1/3 = 1 + 1/3 or 1 1/3

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