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for example 1/4 plus 1/3

the LCD is 12 the best way is to multiply the denominator to find the LCD but sometimes no need to do that

when you find the LCD divide the denominator to the LCD and a multiply the numerator

1/4 + 1/3=12(LCD)

then divide

1/4+1/3=

12 divided by 4 is equal to 3

12 divided by 3 is equal to 4

then multiply

1 multiply by 3 is equal to 3

1 multiply by 4 is equal to 4

then add/subtract

1/4+1/3=3+4/12

=7/12

the final answer

get the lowest term if possible

ex

2\4 +1\2: first get there lcd(least common denominator )the lcd of two fraction are 2 and 4

2=2,4,6

4=4,8,12

as you can see number 4 is the similar least common multiple then get 4 as your denominator

x

4 ÷ 4

the same to the other fraction

×

2 4

then you can now add the same denominator

4 4 4

in lowest term divide the numerator to denominator (if improper fraction)

the answere is