00:02
Hi there! in this question we are asked to multiply together 0 .020 mm, that's a measurement, times 4 .00 mm, also a measurement.
00:15
Well, using our calculator, our calculator does not understand significant figures, so our calculator simply gives us 0 .08.
00:23
And multiplying our units together gives us mm2.
00:28
Well, we need to express this to the correct number of significant figures.
00:32
So we need to think about the rules for significant figures when we are multiplying.
00:39
The rules for multiplication and division are the same, and what they tell us is that we need to express our answer to the same number of significant figures as the measurement having the fewest.
00:59
That would be the fewest significant figures.
01:13
So as we look at the two numbers we've multiplied together here, we see that we have 0 .020.
01:21
Remember, zeros after decimals, after non -zero digits are significant...