Sig Figs

1
Sig Figs

• Rounding and Operations

2
Rounding

• If the digit to the IMMEDIATE right of the last
  sig fig is 5 or greater, round UP
• Ex. 2.536
• 2.54
• If less than 5, leave alone
• Ex. 2.532
• 2.53

3
PracticeRound to 4 Sig Figs

• 38.5432
• Answer 38.54
• 256.75
• Answer 256.8
• 84,791
• Answer 84,790
• 72.350
• Answer 72.35

4
Adding and Subtracting

• Remember way to represent precision
• RULE Your answer must have the same number of
  digits to the RIGHT of the decimal as the
  measurement with the FEWEST digits to the right
  of the decimal.

5
Practice

• 28.0 23.538 25.68
• Answer 77.2
• 43.2 51.0 48.7
• Answer 142.9
• 93.26 81.14
• Answer 12.12
• 5.236 - 3.14
• Answer 2.10

6
Multiplying and Dividing

• Rule Answer has the same number of Sig Figs as
  the measurement with the FEWEST sig figs

7
Practice

• 2.0 x 3.0
• Answer 6.0
• 3.1 x 2.75
• Answer 8.5
• 25.0 / 5
• Answer 5
• 100.00 / 20.0
• Answer 5.00