All the digits are significant in this case. A zero between other digits is always significant, and all zeros after the decimal point are significant.
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A term Significant Figure refers to all the certain digits and one uncertain digit in a measurement.
170.040 has six significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
The greater the number of significant figures, the greater the precision. Each significant figure increases the precision by a factor of ten. For example pi = 3.14 is accurate to 3 significant figures, while pi = 3.14159 with 6 significant figures is a more accurate representation.
Integers ending in 0 are ambiguous cases. The measurement could be accurate to the units digit and in that case all three digits are significant. But is could be accurate to the nearest ten, in which case, only the first two digits are significant.
All digits are significant in this case. Any digit after a decimal point is a significant digit.