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UNIT 7: FRACTION ADDITION - DIFFERENT DENOMINATORS (PART 2)

To add fractions with different denominators, you must first change both denominators to be the same. To do this you will need the skills you learned in Unit 5. Once you have both denominators the same, then you just add the numerators. Sometimes one denominator does not divide evenly into the other, as they did in Unit 6. In this case you must change BOTH denominators into a number that both original denominators will divide into evenly. An easy way to find this new denominator is to multiply the 2 original denominators together to get you new one.

EXAMPLES:
2 does not divide evenly into 3,
so make your new denominator 2 X 3 = 6
3 does not divide evenly into 4,
so make your new denominator 4 X 3 = 12


Add these fractions: (I will give you the first 3 common denominators!)

1)
2)


3)
4)


5) 6)


7) 8)


9) 10)


11) 12)


13) 14)


15) 16)


17) 18)


19) 20)


21) 22)