5 and 10
You need at least two numbers to find a GCF. If that's 55 and 9, or 5 and 59, their GCFs are both 1.
I'll exchange them for the numbers you want to know the GCF of.
One per set of numbers.
You need at least two numbers to find a GCF and there can only be one GCF per set of numbers. Other than that...
2 and 4 are factors of 8. GCFs happen when you compare two or more numbers.
The same as with positive numbers. You need at least two numbers to find a GCF.
Since numbers don't stop, GCFs don't either. To Infinity and beyond!
That's backwards. The GCF of 160 and 20 is 20.
They aren't. 5 is the GCF of 35 and 75. It is the largest number that divides into both 35 and 75 evenly.
Here's a good method to quickly find GCFs: (1) Replace the larger number with the difference of the two numbers. (2) If the two new numbers are the same, then that gives the GCF. Otherwise repeat step (1) on the new numbers. With 64 and 32: (64,32) -> (32,32) (64 has been replaced with 32 since 64-32=32) The two numbers are now the same, so the answer is 32.
It is: 15
25 and 5