1, since 17 is a Prime number.
90 does 90 goes in twice 90 * 90 = 8100
The highest number that goes into both 90 and 147 is 3.
The number 1 goes into both 17 and 42. In this instance, one goes into each number exact the same number of times as the original number like 17 or 42.
15.3
1 and 17. It is a prime number
Oh, dude, let me do some quick math in my head... 17 goes into 90 around 5 times with a remainder of 5. So, like, you can fit 5 seventeens in there, but there's a little bit left over. Math can be so demanding, right?
1 is the only number as 17 is a prime number
3. 6. 9. 10. 15. 30. 90.
Only 1 and 17, since 17 is prime. ■
There is no number except 1 which can divide both 17 and 90. So, GCF = 1.
90
That number is 1.