It would only have one rung, since the only common prime factor of 12, 16 and 26 is 2.
2)12,16,26
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The GCF of 12 and 20 is 4.
Division Ladders are useful for finding Greatest Common Factors, also known as Greatest Common Divisors. If your math problem is to find the GCF of 24 and 60 using a Division Ladder, you would find the answer thusly: 2 | 24, 60 , |_______ 2 |12, 30 , |______ 3| 6, 15 , |____ , 2, 5 You would be dividing by 2 and 3 in this case, then multiply your divisors, 2 x 2 x 3 = 12. Your Greatest Common Factor for 24 and 60 is 12. I used the commas for placeholders, as without them, the vertical lines don't line up.
You need at least two numbers to find a GCF.
22 x 3 = 12, the GCF
The GCF of 24 46 and 80 is 2. This leaves 12 23 and 40 after division respectively. There are no further factors that affect the GCF.