Significant Figure - Rounding

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| By Harry Hwong
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Harry Hwong
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Quizzes Created: 3 | Total Attempts: 5,680
Questions: 20 | Attempts: 393

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Created By: Mr. Hwong™ of Arroyo High School, El Monte, CA
Free Chemistry education to all students: hwongclassroom. Com
Report any errors to me: harry. Hwong@emuhsd. Org
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Consider the number 0.987
The 9 is considered the first significant figure.
The 8 is considered the second significant figure.
and so on. . .
When rounding to the second significant figure, the 7 will cause the 8 to round up.
Answer to rounding to second significant figure: 0.99

• 1.

Round  65.3  to 1 significant figure

• A.

7

• B.

70

• C.

65

• D.

6

B. 70
Explanation
6 is the first significant figure. The 5 will cause the 6 to round up. The 0 is still necessary to keep the same value of the number.

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• 2.

Round  6.581  to 2 significant figures.

• A.

6.5

• B.

6.6

• C.

6.0

• D.

6.600

B. 6.6
Explanation
5 is the second significant figure. The 8 will cause the 5 to round up. It is incorrect to write zeros at the end, which will add additional significant figures.

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• 3.

Round  0.7438  to 2 significant figures.

• A.

0.7430

• B.

0.7400

• C.

0.75

• D.

0.74

D. 0.74
Explanation
4 is the second significant figure. The 3 will cause the 4 to stay the same. It is incorrect to write zeros at the end, which will add additional significant figures.

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• 4.

Round  0.0052135  to 3 significant figures.

• A.

0.00

• B.

0.01

• C.

0.0052100

• D.

0.00521

D. 0.00521
Explanation
1 is the third significant figure. The 3 will cause the 1 to stay the same. It is incorrect to write zeros at the end, which will add additional significant figures. Zeros at the front of nonzero numbers are not considered significant.

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• 5.

Round  481.4  to 3 significant figures.

• A.

481

• B.

482

• C.

481.0

• D.

482.0

A. 481
Explanation
1 is the third significant figure. The 4 will cause the 1 to stay the same. It is incorrect to write zeros at the end, which will add additional significant figures.

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• 6.

Round  0.298204  to 1 significant figure.

• A.

0.2

• B.

0

• C.

0.3

• D.

0.300000

C. 0.3
Explanation
2 is the first significant figure. The 9 will cause the 2 to round up. It is incorrect to write zeros at the end, which will add additional significant figures.

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• 7.

Round  80.2543  to 4 significant figures.

• A.

80.2500

• B.

80.2600

• C.

80.25

• D.

80.26

C. 80.25
Explanation
5 is the fourth significant figure. The 4 will cause the 5 to stay the same. It is incorrect to write zeros at the end, which will add additional significant figures.

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• 8.

Round  54123.82  to 4 significant figures.

• A.

54124

• B.

5412

• C.

54120

• D.

54120.00

C. 54120
Explanation
2 is the fourth significant figure. The 3 will cause the 2 to stay the same. The 0 is still necessary to keep the same value of the number. The decimal and the two zeros after the decimal are not necessary and will add additional significant figures.

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• 9.

Round  0.002852895  to 3 significant figures.

• A.

0.00285

• B.

0.00

• C.

0.002850000

• D.

0.00286

A. 0.00285
Explanation
5 is the third significant figure. The 2 will cause the 5 to stay the same. It is incorrect to write zeros at the end, which will add additional significant figures.

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• 10.

Round  0.000 025 385 631  to 3 significant figures.

• A.

0.000

• B.

0.000 025

• C.

0.000 025 4

• D.

0.000 025 400 000

C. 0.000 025 4
Explanation
3 is the third significant figure. The 8 will cause the 3 to round up. It is incorrect to write zeros at the end, which will add additional significant figures.

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• 11.

Round  10.2  to 1 significant figure.

• A.

1

• B.

10

• C.

10.

• D.

10.0

B. 10
Explanation
1 is the first significant figure. The 0 will cause the 1 to stay the same. The 0 is still necessary to keep the same value of the number.

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• 12.

Round  0.05060  to 2 significant figure.

• A.

0.0

• B.

0.051

• C.

0.050

• D.

0.05000

B. 0.051
Explanation
Third 0 is the second significant figure. The 6 will cause the 0 to round up. It is incorrect to write zeros at the end, which will add additional significant figures.

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• 13.

Round  0.003501  to 2 significant figures.

• A.

0.0

• B.

0.0035

• C.

0.00350

• D.

0.003500

B. 0.0035
Explanation
5 is the second significant figure. The 0 will cause the 5 to stay the same. It is incorrect to write zeros at the end, which will add additional significant figures.

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• 14.

Round  0.276  to 1 significant figure.

• A.

0

• B.

2

• C.

0.3

• D.

0.2

C. 0.3
Explanation
2 is the first significant figure. The 7 will cause the 2 to round up.

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• 15.

Round  5.0063  to 3 significant figures.

• A.

5.00

• B.

5.01

• C.

5.0100

• D.

501

B. 5.01
Explanation
The second 0 is the third significant figure. The 6 will cause the 0 to round up. It is incorrect to write zeros at the end, which will add additional significant figures.

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• 16.

Round  8.2091  to 4 significant figures.

• A.

8.2090

• B.

8.209

• C.

8.210

• D.

8.21

B. 8.209
Explanation
9 is the fourth significant figure. The 1 will cause the 9 to stay the same. It is incorrect to write zeros at the end, which will add additional significant figures.

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• 17.

Round  90710  to 2 significant figures.

• A.

90000

• B.

91

• C.

91000

• D.

91000.

C. 91000
Explanation
0 is the second significant figure. The 7 will cause the 0 to round up. The 0 at the end of the round 1 is still necessary to keep the same value of the number.

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• 18.

Round  0.0100331  to 5 significant figures.

• A.

0.0100

• B.

0.010033

• C.

0.0100331

• D.

0.0100330

B. 0.010033
Explanation
The fourth 0 is the fifth significant figure. The 3 will cause the 0 to stay the same. It is incorrect to write zeros at the end, which will add additional significant figures.

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• 19.

Round  73860.01  to 3 significant figures.

• A.

73900.

• B.

74000

• C.

73900

• D.

73800

C. 73900
Explanation
8 is the third significant figure. The 6 will cause the 8 to round up. The 0 is still necessary to keep the same value of the number.

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• 20.

Round  0.002 365 730 8  to 4 significant figures.

• A.

0.002

• B.

0.002 366

• C.

0.002 366 000 0

• D.

0.002 365

B. 0.002 366
Explanation
5 is the fourth significant figure. The 7 will cause the 5 to round up. It is incorrect to write zeros at the end, which will add additional significant figures.

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• Current Version
• Mar 19, 2023
Quiz Edited by
ProProfs Editorial Team
• Sep 03, 2017
Quiz Created by
Harry Hwong

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