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There is no number that goes into both. must be a trick question
this is another person not the same one :)
the number that goes into 12 and 21 is 3 which is a 5th grade problem
who ever said theres no number that goes into 12 and 21 is WRONG!
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Related questions
What number goes into 12 and 21 and14?
The HCF of the given numbers is 1
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21 is 12 percent of what number?
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