Aggregate numbers from child nodes
I really like the way Memofon lets you sum numbers up from child nodes (go to http://www.memofon.com/playground and select calculation from examples). I would love to be able to sum up units from nodes in MindMup, especially in conjunction with with Progress extension
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Marcel Waldvogel commented
Measurements ("M") provides something like this. However, the numbers are not directly summed (which the MindMup guys might consider changing, *HINT*), but you have to select the subtree first ("{").