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# Significant Figure Rules

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## Richard Datwyler

on 21 April 2014

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#### Transcript of Significant Figure Rules

Significant Figure Rules

zero's that hold places, are not significant

1000
1250
0.00234
zero's between non-zero number are significant
101
150,002
0.00305
2,010
Finally zeros after the decimal point AND non-zero numbers are significant - they show accuracy
101.10
5.800
0.005700
Math with significant figures
whichever number has the least significant figures, will tell you the number of significant figures in the answer.
2.5 x 10025 = 25062.5
357452.01 / 261 = 1369.54793
1024.959 / 82 = 12.4995
addition or subtraction keeps the least accurate measurement.
12.0004
124.057
+ 2.5
138.5574
Whole numbers and unit conversions
if you have an equation where a number is used, it is not significant and won't affect the answer.
conversions don't affect the significance either
39.52 in
12 in
1 ft
= 3.2933333