What fraction of the marbles are orange?

A jar is filled with green, yellow and orange marbles. If 1/4 of the marbles are green and 2/7 are yellow. What fraction of the marbles are orange?
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1 Answer

Find the common denominator of the two which in this case, would be 28. Then multiply the top by the other denominator.

1/4=7/28

2/7=8/28

Add those together and you get 15/28. Subtract 28-15 to find 13.

So, 13/28 are orange marbles

Dont forget to label! Hope this helps!!
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