SOLUTION: how subtract fractions

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Question 26831: how subtract fractions
Answer by elima(1433) About Me  (Show Source):
You can put this solution on YOUR website!
When subtracting and adding fractions you need to have LCD;
ex;
2%2F5-1%2F2=
You need to have common denominators first; let's make it 15;
so what times 5 = 15; 3, so you multiply the numerator by 3;
2%2F5=6%2F15
What times 3 = 15; 5, so we multiply the numerator by 5;
1%2F3=5%2F15
Now that we have LCD we can subtract, you only subtract the numerators;
6%2F15-5%2F15=-1%2F15
hope you understand
=)