1 and 3
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HCF(9, 12) = 3
9 over 12 reduces to 3 over 4. Divide the denominator (12) and the numerator(9) by 3 because 3 is the largest number that goes evenly into both numbers.
Only 1 goes in to 9 and 11 as a whole number. Technically any number can go into any number.
The number is 1.
The number is 1.