1. Counting Significant Figures and Calculating with Significant Figures
2.5 Part 2

3. Vocabulary
Significant figures

4. 2.5 Part 2 Learning Outcomes
To learn the number of digits which can be claimed when reporting results and carrying out calculations with the results

5. The SIG FIG Rules

23. Rules for Calculating with Significant Figures

24. Where the Heck to Round?

33. WHAT IF YOU HAVE MIXED CALCUALTIONS?? What is the order of operations?
BEDMAS
See SWB page 40 for an example
What is the important message at the bottom of SWB page 38?!!?

34. Rounding Rules Look at the number behind the one you’re rounding.
If it is 0 to 4 don’t change it.
If it is 5 to 9 make it one bigger.
Round to four sig figs.
to three sig figs.
to two sig figs.
to one sig figs.
45.46
45.5 45 50

35. Round the following to 3 significant figures
1.148
16.74
178.49
15.57

36. Practice task(s) to learn these new skills
1. Exercise #42 page 28
2. Exercise #55 page 37, # 56 page 39 (yes… all of them!!) and #57 and #58 page 40 (okay, now only do the odd letters)
3. Exercise # 59 page 40 (yes… do ALL of them again please)