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I mostly copied Michael Draper's solution but used Kenda's Question.Name to update the Base. I love how simple it is.
I love any feedback and I did test this so I know the macro works. My main learning from Mr Draper on iterative macros is that you have to have same fields coming out of iterative output of the macro as those going right before the macro. So in my case only have 3 fields (Decimal, Original Number and Base) Make sure they are in this order as well (same field positioning). Another callout is that if you use the '%Question.Name%' in your formula tool, the workflow will throw error as it only works with the App running, you could hardcode a string or number to get around it for testing. For grouping I didn't use record ID, I used Kenda's original number and sorted Engine.Iteration before summary tool. I banged my head on this one for a little while but it is rewarding to understand it better.
Great challenge! Here's my solution: