Significant Figures Standard Rules

Significant Figures Standard Rules

Rule

Examples

1. Any non-zero number is significant

123 L = 3 sig figs,

2. Zeros appearing in between nonzero digits are significant

40.7 L = 3 sig figs

12,983 mL = 5 sig figs

87,009 km = 5 sig figs

3. Zeros appearing in front of all nonzero digits are not significant

0.095897 m = 5 sig figs

.0009 kg = 1 sig fig

4. Zeros at the end of a number and to the right of the decimal are significant

85.00g = 4 sig figs

9.000000000mm = 10 sig figs

5. Zeros at the end of a number but to the left of the decimal is only significant

if there is a decimal point

2000 m = 1 sig fig

2000. m = 4 sig figs

.Pacific --------------------------------------- Atlantic

If the number has a decimal, come from Pacific Ocean.

If the number has no decimal, come from the Atlantic Ocean.

In both cases, start counting when you reach the first number and continue counting until you reach the end of the number.

Rounding Rules

Everything stays the same as normal rounding except for one number. If you are number ends in a 5 your round so the number will end in an even

number.

So����..

34.555 rounded to four sig figs is ?

34.56

And����

34.565 rounded to four sig figs is ?

34.56

235 ? 240

(rounded to two sig figs)

265 ? 260

(rounded to two sig figs)

245000 ? 240000

(rounded to two sig figs)

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