If two numbers have m and n significant digits, respectively, then then product can have at most m+n. However, the normally it is the minimum of m and n.
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rules for calculating S.F. are: 1,all non zero digits r significant 2,
If they did not use rules all their calculations would simply lead to random digits!
Five. All nonzero digits are significant and zeros in between significant digits are significant.
All four of the digits given are significant digits.
This number has seven significant digits.