Precision and greatest possible error in a measurement

Answer Key - Grade 9 Math Worksheet

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

1. 1.

   Ari measures a leaf with a ruler as 14.6 cm, to the nearest tenth. What is the greatest possible error?

   0.05
2. 2.

   Bo measures a table with a tape as 2.80 m, to the nearest hundredth. What is the greatest possible error?

   0.005
3. 3.

   Jun times a swim with a stopwatch as 31.0 s, to the nearest tenth. What is the greatest possible error?

   0.05
4. 4.

   Kira measures a crayon with a ruler as 8.4 cm, to the nearest tenth. What are the smallest and largest it could be, smallest first?

   8.35, 8.45
5. 5.

   Luz measures a button with calipers as 12 mm, to the nearest millimeter. What are the smallest and largest it could be, smallest first?

   11.5, 12.5
6. 6.

   Pia measures a pencil twice with a ruler and gets 4.5 cm and 4.50 cm. Which measurement is more precise?

   • 4.50 cm
   • They are equally precise
   • 4.5 cm
7. 7.

   Zee times a race twice with a stopwatch and gets 1.05 s and 1.1 s. Which measurement is more precise?

   • 1.05 s
   • They are equally precise
   • 1.1 s
8. 8.

   Ari measures a log with a tape as 6.5 m, to the nearest tenth. Which of these could be the true amount?

   • 6.7
   • 6.53
   • 6.58
   • 6.35
9. 9.

   Bo measures a table with a tape as 140 cm, to the nearest 10 cm. Which of these could be the true amount?

   • 143
   • 155
   • 148
   • 128
10. 10.

    Esme weighs a watermelon on a scale as 3.2 kg, to the nearest tenth. Which of these could be the true amount?

    • 3
    • 3.24
    • 3.4
    • 3.27