The factors of 21 are 1 x 3 x 7 x 21.
The factors of 28 are 1 x 2 x 4 x 7 x 14 x 28.
The GCF of 21 and 28 is 7.
15, 30 and 45 have a GCF of 15.
The prime numbers between 15 and 30 are: 17 19 23 29.
The GCF is 15.
The GCF of 20 and 40 is 20 The GCF of 15 and 30 is 15 The GCF of 15, 20, 30 and 40 is 5.
The GCF of 5, 15, and 30 is 5. Since 5 is a factor of both 15 and 30, it must be the GCF.
15, 30 and 45 have a GCF of 15.
21 and 28
15
15 and 30
It is: 15
15, 30 and 45.
15, 30, 45
You need at least two numbers to find a GCF. If that's 15, 30 and 60, the GCF is 15.
Gcf - 5 lcm - 30
No but it can be the same as the biggest number as for example the gcf of 30 and 15 is 30
15 and 270 do.
2 and 15