Of course it is not -16.422 because you are warned about significant digit.
The result is -16.422000 but if you consider the significant digits, the answer is -16.
That's right.
The greatest number in the multiplication process is the multiplier (5.1)
Now how many significant digits does 5.1 have? 2 significant digits (5.1)
Now the answer should also have 2 significant digits.
-16.422
Take the first 2 digits from the left.
-16.422
The underlined number is the product of the two numbers, in terms of significant digits.
