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OpenStudy (anonymous):
Why how did the 21 and 2 come about?
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OpenStudy (anonymous):
OpenStudy (anonymous):
The common denominator for 4 and 6 is 12. So you ask yourself,"what times 4 equals 12" and that would be 3. So you multiply 3 to 7 and you get 21.
OpenStudy (anonymous):
For the other one you 2 goes into 12 6 times.
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