The GCF is 3.
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-8
Because 4 is the largest number that will divide into both of those numbers evenly, with no remainder.
The Least Common Multiple (LCM) is the smallest number that two or more numbers will divide into evenly and 12 is the smallest number that both 4 and 6 divide into evenly.
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.
Because 3 is the largest number that divides into both 12 and 15 evenly with no remainder.