Answer:
The GCF of 16, 40, and 68 is 4
Explanation:
When solving GCF, I usually like to begin with the lowest number in the list (16 in this case) unless it is completely irrational and does not make sense.
16 ÷ 16 = 1
40 ÷ 16 = 2.5
68 ÷ 16 = 4.25
NOTE!!! If the quotient is a decimal, it CANNOT be the GCF
I then move onto the next smallest factor making up 16, which is 8:
16 ÷ 8 = 2
40 ÷ 8 = 5
68 ÷ 8 = 8.5
This clearly did not work, so I move onto the next smallest factor, 4:
16 ÷ 4 = 4
40 ÷ 4 = 10
68 ÷ 4 = 17
As shown above, none of the numbers contain a decimal, making this the GCF of 16, 40, and 68. I hope this helped!!!