Counting Significant Figures and Calculating with Significant Figures

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Presentation transcript:

Counting Significant Figures and Calculating with Significant Figures 2.5 Part 2 http://www.youtube.com/watch?v=ZuVPkBb-z2I&feature=channel

Vocabulary Significant figures

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

The SIG FIG Rules

Rules for Calculating with Significant Figures

Where the Heck to Round? http://www.youtube.com/watch?v=kB2szfcwu1A&feature=channel

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?!!?

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 45.462 to four sig figs. to three sig figs. to two sig figs. to one sig figs. 45.46 45.5 45 50

Round the following to 3 significant figures 1.148 16.74 0.001201 178.49 1 000.00 0.000 4 15.57

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)