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QUESTION

# How many significant figures are there in the measurement 238.230 kg?

Six .

The first things to look for here are non-zero digits, which as you know are always significant.

This measurement has a total of 5 non-zero digits

2,3,8,2,3

so right from the start you know that it will have at least five significant figures.

Now focus on the trailing zero. Trailing zeros are zeros that follow a non-zero digit and are not followed by other non-zero digits.

When trailing zeros follow a non-zero digit and a decimal place, they are considered significant. This means that your measurement will contain 6 significant figures

238.230 -> five non-zero digits and one significant trailing zero