# Sig Figs Cheat Sheet

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```							                            Sig Figs Cheat Sheet

How to Determine Sig Figs…..
1. All non zero numbers are significant
Ex. 982.15 kg  5 sig figs

2. Leading zeros are not significant
Ex. .00472  3 sig figs

3. Captive zeros are significant
Ex. 10.3  3 sig figs

4. Trailing zeros are not significant unless a decimal is present
Ex. 100  1 sig fig
Ex. 100.  3 sig figs

OR………….

The Arrow Technique

Draw an arrow over the number. Once the arrow “hits” a non-zero digit, then
everything after the digit in the direction of the arrow is significant

1. If a decimal is present  draw arrow from left to right
Hint: Decimal Present, draw arrow from Pacific Ocean
to Atlantic Ocean
2. If no decimal is present  draw arrow from right to left
Hint: Decimal Absent, draw arrow from Atlantic to Pacific

How to determine sig figs for multiplying and dividing….
have as many sig figs as your least accurate measurement
Ex. 4.0m * 7.0 m =28m2
Ex. 4m * 7m = 30 m2

How to determine sig figs for adding and subtracting…..
1. Line numbers up so each place is aligned
2. Add or subtract the numbers
3. Draw a line to the right of the least accurate place
4. Whichever place is the least accurate that is where you stop
Ex. 52.0 + 6005 + 2.3=
52.0
6005
2.3
6059.3  6059

```
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