Here are some clues to a mystery number.
I am a factor of 40.
when you pair me with 15, we have an LCF of 15
I am not 1.
what is the number?
The mystery number is 5.
5 is a factor of 40, as 40 divided by 5 is 8.
When paired with 15, the least common factor (LCF) is 15. This is because 5 is a factor of 15 as well.
5 is not 1, so it fits all the criteria mentioned in the clues.
what is the GCF of 81 and 72?
8. 9. 12. 18.
The greatest common factor (GCF) of 81 and 72 is 9.
To find the GCF, you can find the prime factorization of both numbers:
81 = 3^4
72 = 2^3 * 3^2
Then, identify the common factors between the two numbers:
The common factor is 3^2 = 9.
Therefore, the GCF of 81 and 72 is 9.