One is not a prime, but it is a factor of ALL numbers. Hence when we cancel factors using colours, if we have no colours left, we have grey. Number 1 is grey. Let's call it the super special invisible factor.
For example both 5 and 10 have blue in their donuts. Numerator (5): Take the blue out and you get grey (1). Denominator (10): take the blue out to get orange. (2)
One half is the same as five tenths.
1/2 = 5/10
Will this help students see "x" is a number rather than a thing?
This frame can be used to display our "prime factor thinking" in a visual way.
When we understand the process we no longer need the Prime Climb Number Frames.