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Enter a new number in a field then subtract the previous field from that number?

Question asked by jondresser on Oct 30, 2015
Latest reply on Oct 30, 2015 by jondresser

I'm new at Filemaker. I'm trying to enter a new "Water Meter Reading" into a record field. Then I want to subtract last month's reading from this new number. I'd like to place the resulting number into a Water Used field. Is it possible?