can someone explain to me how to add 5/20 and 6/15 I don't understand lowest common denominators?

can someone explain to me how to add 5/20 and 6/15 I don't understand lowest common denominators?

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Yeah, basically you can't add two fractions unless they have the same denominator.

the denoms are 20 and 15, so list the multiples:
15: 15, 30, 45, 60, 75 ...
20: 20, 40, 60, 80 ...

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