9 & 24
Pick any two coprime numbers. Multiply both by 9. Their GCF will be 9.
4 and 9 have a GCF of 1
The same as what? The GCF of two numbers will be the same; the GCF of 3 and 9 will always be 3. The GCF of 9 and 12 will also always be 3, but the GCF of 4 and 12 will always be 4.
You need at least two numbers to find a GCF. If that's 4 and 9, the GCF is 1.
You need at least two numbers to find a GCF. If that's 11 and 9, the GCF is 1.
12 57
The Greatest Common Factor of the two numbers is 9. 288/9 = 32, 405/9 = 45.
Pick any two numbers, x and y that are coprime. That is, they have no factor in common. Then GCF of 9x and 9y will be 9. Pick any two numbers, x and y that are coprime. That is, they have no factor in common. Then GCF of 9x and 9y will be 9. Pick any two numbers, x and y that are coprime. That is, they have no factor in common. Then GCF of 9x and 9y will be 9. Pick any two numbers, x and y that are coprime. That is, they have no factor in common. Then GCF of 9x and 9y will be 9.
You need at least two numbers to find a GCF. If that's 2 and 79, the GCF is 1. If that's 27 and 9, the GCF is 9.
You need at least two numbers to find a GCF. If that's 18 and 9, the GCF is 9.
You need at least two numbers to find a GCF. If that's 9 and 45, the GCF is 9.