If the Torah forbids addition and subtraction, what does it imply for Jews, and for ultra orthodox jews, regarding practical life? It is a baffling rule.
Can you you use money at all? can you not subtract change?
Can you use a clock to count the hours of the day? i.e. doing something in quarter of an hour.
Can you number the pages of a book?
Can you count the difference in age between members of your family?
Is it not a rule that is followed in modern life? so what does it imply theologically? Who should comply by the rule and who shouldn't?