I found an RTI "If this... then this..." document for intervention instruction for Reading or ELA but never found one for Math. I put this together after college. It's not perfect or fool proof, but it's been effective in my experiences, and it does fill the void of an "If this...then this" piece for teaching math and doing RTI.
Interventions include strategies for the following areas:
-fluency in math facts
Hope you enjoy! :)