Significant Figures Lesson
Presentation
•
Science, Mathematics, Chemistry
•
•
Practice Problem
•
Medium
Danae Boyden
Used 30+ times
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9 Slides • 8 Questions
1
Significant Figures
2
Significant Figures
Every digit of a number used to express it to the required degree of accuracy, starting from the first nonzero digit.
There are 5 rules to determine how many "sig figs" a number has...
3
Rule #1
ALL non-zero digits DO count!
498
3 sig figs!
2 sig figs!
1 sig fig!
79
2
4
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
5
Rule #3
Zeroes between significant figures DO count
409
5 sig figs!
3 sig figs!
4 sig figs!
7006
20004
6
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
7
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
8
Multiple Choice
How many significant figures?
7945
1
2
3
4
9
Multiple Choice
How many significant figures?
0.150
1
2
3
4
10
Multiple Choice
How many significant figures?
76400.0
3
4
5
6
11
Multiple Choice
How many significant figures?
76490
3
4
5
6
12
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
13
Multiple Choice
Which one is rounded correctly for the following equation?
1.987 - 0.48 = ?
1.5
1.51
1.507
2
14
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
15
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
16
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
17
Multiple Choice
Which answer is rounded to the correct place for the equation below?
487.0 / .0024 = 121750.0
121750.0
121800
122000
120000
Significant Figures
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