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decode EVERYTHING about fractions.
Enter a simple exercise:
Bruchrechnen-KAPIERT.de is the leading site about fractions in Germany.
This is the English version Fractions-DECODED.com.
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If you would like to have a vivid explanation with a detailed example, please read the page Step 3: Simplify, Expand, Common Denominator
21 can be disassembled into 3 * 7 - 35 into 5 * 7.
Calculate the LCM by multiplying all their prime factors:
LCM = 3 * 5 * 7 = 105
Answer 1 is correct.
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