Significant figures in measurements and calculations

Answer Key - Grade 10 Science Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   What is 2.71828 rounded to 3 significant figures, Ari?

   2.72
2. 2.

   What is 0.004567 rounded to 3 significant figures, Bo?

   0.00457
3. 3.

   What is 3.14159 rounded to 4 significant figures, Esme?

   3.142
5. 4.

   On the measurement card, which digit of 4.65 cm is estimated, Jun?

   • The 6
   • The 5
   • The 4
6. 5.

   On the measurement card, how small is the ruler's smallest mark, Kira?

   Use the picture in question 4.

   • 0.1 cm
   • 0.01 cm
   • 1 cm
7. 6.

   On the measurement card, why is the reading 4.65 cm and not 4.7 cm, Luz?

   Use the picture in question 4.

   • The ruler reads in whole cm
   • It lies between the marks
   • It is closer to the 4.7 mark
8. 7.

   How many significant figures does 0.0340 have, Milo?

   • 5
   • 3
   • 2
9. 8.

   Do the zeros at the start of 0.0072 count as significant figures, Ren?

   • No: they place the decimal point
   • Yes, but just the last one of them
   • Yes: each digit counts
10. 9.

    Does the zero in 305 count as a significant figure, Tala?

    • Yes: it sits between nonzero digits
    • No: zeros don't count
    • No: zeros between digits are placeholders
11. 10.

    Why does the last zero in 2.50 g count, Zee?

    • It makes the number look neat
    • It shows the tool read that place
    • Trailing zeros are placeholders