Calculations with
Significant Figures
Review: How many significant
figures
804.05
0.014403
1002
400
30000.
0.000625000
How can you write seven
thousand with
1)
2)
3)
1 significant figure
4 significant figures
6 significant figures
Round each to 3 Significant
Figures
1)
2)
3)
4)
5)
31.068
2.613
81.436
0.001567
1.1353
149.51
7) 6.561
8) 13.1252
9) 143.81
10) 0.000355
6)
Multiplying and Dividing

Multiply or divide the number out as
normal but round the answer to the least
number of significant figures in the
problem
Solve each with correct Sig Figs
1)
2)
3)
4)
2.4 x 15.82 =
94.20  3.16722 =
(5.682 x 105) x (2.87 x 104) =
(2.145 x 10-5)  (6.75 x 104) =
Addition and Subtraction

Add or subtract as normal but round the
answer with the same number of decimal
places as the quantity in the calculation
having the least
Solve each with correct Sig Figs
1)
2)
3)
4)
5.44 – 2.6103
2.099 + 0.05681
4.6521 + 183.2 + 240
0.004375 – 0.0036