Significant FiguresMultiplying and dividing

Multiplying and Dividing with Significant FiguresWhen multiplying or dividing numbers round the answer to the least number of significant figures found in any of the numbers used.

1. Combining numbers- you are as good as your worst number!

V = distancetime

V = 25.3698 m2.0 min

6 sig figs

2 sig figs

2 sig figs= 13 m/min

Multiplying and Dividing with Significant FiguresWhen multiplying or dividing numbers round the answer to the least number of significant figures found in any of the numbers used..2.

2.5463 x 6.554 x 2.3 x 5.3222.336 1.5 7.896

must round to 2 sig figs like= 7.3832

= 7.4

Multiplying and Dividing with Significant FiguresWhen multiplying or dividing numbers round the answer to the least number of significant figures found in any of the numbers used.

3.

5.33 x 10-8 x 6.554 x 106 x 2.31 x 10-15 2.336 x 105 1.53 x 10-11

22.6 x 10-11

4. Evaluate

1.555 x 10-10 x 4.22 x 109 x 5.66 x 10-7 x 3.858 x 104

5.953 x 105 6.8 x 10-8 9.35 x 10-3

0.38 x 102

TRY

5.

8.445 x 10-10 x 6.449 x 109 x 1.66 x 10-9 x 7.858 x 104 8.953 x 105 2.666 x 10-4 5.566 x 10-3

5.35 x 10-4

Remember BEDMAS: When you have to solve an equation with many ordersOf operations, follow BEDMAS. Divide and multiply before you add and Subtract.

50.35 x 0.106 – 25.37 x 0.176 = ?

STEP 1: 50.35 x 0.106 = 5.3371= 5.34 25.37 x 0.176 = 4.46512= 4.47

STEP 2: 5.34 – 4.47 =

0.87 2 sig figs after the decimal

When operations are mixedx or % comes before + or –For x or % you follow the rule(least number of sig figs)For + or – you follow the rule( least number of decimal places)You take it step by step

Homework –For practice

Hebden: Page 39 #56 (B,C,E,F,H,K)

Page 40 #58 (B,C,F,H,J,)

Page 40 #59 (a, d, e, g)

WE ARE DONE UNIT 2!!!!!!