Question

If you are a mass of 3.7 g to a mass of 9.495 g the sum with the correct number of significant digits is

Answer 1

Answer: 13.2 g

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Step-by-step explanation:

Add the values like you normally would

3.7+9.495 = 13.195

Then round to one decimal place, because the 3.7 is to one decimal place. We go for the smallest decimal place count of the original values. This only applies to adding and subtracting.

13.195 rounds to 13.2 when rounding to one decimal place.

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Side note: if you multiplied 3.7 with 9.495, you round the result to 2 sig figs since 3.7 has the smaller sig fig count. Same goes with division.

So this means 3.7*9.495 = 35.1315 = 35 when rounding to 2 sig figs.