The best way to figure this problem out is to find out all of the factors of the smaller number, which is 90. Start with the highest factor of 90 and work your way down until you find a number that goes into 756.
Here is the answer.
The factors of 90 are 1,2,3,5,6,9,10,15,18,30,45,90
90 does not go into 756.
45 does not go into 756.
30 does not go into 756.
18 goes into 756, so the answer is 18.
The GCF is 252.
1422
756 is 90% of 840
The GCF is 18.
756
The GCF is 90.
The GCF of 15 and 90 is 15.
The GCF is 5.
If A is a factor of 90, the GCF is A. If A is a multiple of 90, the GCF is 90. If A is co-prime with 90, the GCF is 1.
90 and 180 have a GCF of 90.
The GCF is 90.
GCF of 90 and 75 is 15.