Sig Figs and DA Review Unit 6
Presentation
•
Chemistry
•
9th - 12th Grade
•
Hard
Vasilios Savopoulos
FREE Resource
8 Slides • 9 Questions
1
Rule #1
ALL non-zero digits DO count!
498
3 sig figs!
2 sig figs!
1 sig fig!
79
2
2
Rule #2
Zeros to the right of decimal and a significant digit DO count.
498.00
4 sig figs!
5 sig figs!
3 sig figs!
79.0
2.000
3
Rule #3
Zeroes between significant figures DO count
409
5 sig figs!
3 sig figs!
4 sig figs!
7006
20004
4
Rule #4
Zeroes at the end of a whole number DO NOT count.
400
1 sig fig!
1 sig fig!
2 sig figs!
7500
20
5
Rule #5
Zeroes in front of a number as placeholders DO NOT count.
0.004
2 sig figs!
1 sig fig!
4 sig figs!
0.07500
0.20
6
Multiple Choice
How many significant figures?
7945
1
2
3
4
7
Multiple Choice
How many significant figures?
0.150
1
2
3
4
8
Multiple Choice
How many significant figures?
76490
3
4
5
6
9
Sig figs when adding/subtracting
When adding or subtracting, round your answer to the same place as the number with the LEAST amount of DECIMALS.
45.879 + 32.1 = 77.979
45.879 + 32.1 = 77.979 ------> 78.0
5.41 + 65.456 = 70.866
5.41 + 65.456 = 70.866 -------> 70.87
10
Sig figs when multiplying/dividing
When multiplying or dividing, round your answer to the same place as the number with the LEAST amount of SIGNIFICANT FIGURES.
47.06 x 1.0004 = 47.078824
47.06 x 1.0004 = 47.08
98.04 = 32.68
3
98.04 = 30
3
11
Multiple Choice
Which one is rounded to the correct number of significant figures for the following equation?
7520 x 0.021 = 157.92
157.92
157.9
158
160
12
Multiple Choice
Which answer is rounded to the correct place for the equation below?
457.1 + 459.32 = 916.42
916.42
916.4
916.0
916
13
Multiple Choice
Which answer is rounded to the correct place for the equation below?
487.0 / .0024 = 121750.0
121750.0
121800
122000
120000
14
15
Multiple Choice
How many inches are there in a football field (100 yards)? 1 yard = 3 feet; 1 foot = 12 inches
360 inches
3,600 inches
3,600 feet
300 feet
16
Multiple Choice
The length of a desk is 3.5 feet. How many centimeters is the length? (there are 2.54 cm in an inch; 12 inches in a foot)
17
Multiple Choice
How many walking paces are there approximately as you walk down Main Street (0.25 miles)? 1 mile = 5280 feet; 1 foot = 12 inches; 22 inches = 1 walking pace
15,840 walking paces
720 walking paces
720 inches
2420 walking paces
Rule #1
ALL non-zero digits DO count!
498
3 sig figs!
2 sig figs!
1 sig fig!
79
2
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