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THREE

Although they are an important part of the number the three zeros after the decimal point are positional zeros. The rule is :- " Zeros must be kept to show the position of the decimal point or to indicate that zero is a significant figure."

The final zero (after 54) is the third significant figure.

0.000 540

**** positional zeros.

0.000 540

..........*** significant figures (three)

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Q: How many significant digits are contained in the number 0.000540?
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