Identifying no. of Significant Figures, Scientific and Standard Notations

Significant Figures Worksheet – Interactive Quiz

Practice identifying significant figures and writing numbers in scientific notation. Select one answer for each question and click Submit Quiz.

1. How many significant figures are present in 456?

1 2 3 4

2. How many significant figures are present in 0.00456?

2 3 4 5

3. How many significant figures are present in 5007?

2 3 4 5

4. How many significant figures are present in 0.0205?

2 3 4 5

5. How many significant figures are present in 1200?

2 3 4 5

6. How many significant figures are present in 7.080?

2 3 4 5

7. How many significant figures are present in 0.00070?

1 2 3 4

8. How many significant figures are present in 9.090?

2 3 4 5

9. How many significant figures are present in 100.0?

2 3 4 5

10. How many significant figures are present in 0.001230?

2 3 4 5

11. Write 4500 in scientific notation.

4.5 × 10² 4.5 × 10³ 45 × 10² 0.45 × 10⁴

12. Write 0.0032 in scientific notation.

3.2 × 10⁻³ 3.2 × 10⁻² 32 × 10⁻⁴ 0.32 × 10⁻²

13. Which equals \(6.5 \times 10^4\)?

650 6500 65000 650000

14. Which equals \(8.1 \times 10^{-2}\)?

0.081 0.0081 8.1 81

15. Write 730000 in scientific notation.

7.3 × 10⁵ 73 × 10⁴ 0.73 × 10⁶ All represent same value but A is standard form

16. Write 0.00089 in scientific notation.

8.9 × 10⁻⁴ 8.9 × 10⁻⁵ 89 × 10⁻⁵ A and C

17. Number of significant figures in 3.40 × 10⁵ is

2 3 4 5

18. Number of significant figures in 6.020 × 10⁻³ is

2 3 4 5

19. Which number has exactly 2 significant figures?

0.040 0.0040 Both A and B Neither

20. Which number has 4 significant figures?

0.5000 5000 50.0 0.050

Answer Key and Detailed Solutions

1. C. 456 → all non-zero digits are significant → 3 SF.

2. B. Leading zeros are not significant → 4,5,6 → 3 SF.

3. C. Zeros between non-zero digits are significant → 4 SF.

4. B. Leading zeros ignored, internal zero counted → 2,0,5 → 3 SF.

5. A. Trailing zeros without decimal are usually not significant → 2 SF.

6. C. 7,0,8,0 all count → 4 SF.

7. B. 7 and trailing zero count → 2 SF.

8. C. 9,0,9,0 → 4 SF.

9. C. Decimal point makes trailing zeros significant → 4 SF.

10. C. Significant digits are 1,2,3,0 → 4 SF.

11. B. 4500 = 4.5 × 10³.

12. A. Move decimal 3 places right → exponent −3.

13. C. 6.5 × 10000 = 65000.

14. A. 8.1 × 10⁻² = 0.081.

15. D. All are equal, but scientific notation requires coefficient between 1 and 10.

16. D. Both forms represent same value, A is standard scientific notation.

17. B. 3.40 has 3 significant figures.

18. C. 6.020 contains 4 significant figures.

19. C. Both contain exactly two significant figures.

20. A. 0.5000 contains four significant figures.