1. Is it OK to write down all digits on your calculator?
3.120 x
After multiplying and dividing –
Round answer to least number of significant digits
Round to the weakest link
PHYSICS 105 Part 1

2. Is it OK to write down all digits on your calculator?
After adding and subtracting –
Round answer to first column containing an estimated digit
Round to the weakest column
PHYSICS 105 Part 1

3. Problem Set #1
1492 x 200 x (8.60 x 10.4)(9.23 x 106) x
Sig Figs (1)
Sig Figs (4)
Sig Figs (3)
Sig Figs (2)
Work these on your calculator and write down the answer.
What is the answer using correct significant digits?
Your calculator will not round to the correct number of significant digits.
PHYSICS 105 Part 1

4. Round to 2 significant digits
187000
299
12.5
190000
300
???
Rule of 5’s – when a number is exactly half way between two numbers, round to the even number.
12.5
11.5
675000 12
680000
0.0046 13
PHYSICS 105 Part 1