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.

   Esme measures a trail on a map as 270 m, to the nearest 10 m. What is the greatest possible error?

   5
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.

   Milo measures a quilt with a tape as 2.26 m, to the nearest hundredth. What are the smallest and largest it could be, smallest first?

   2.255, 2.265
5. 5.

   Noah weighs a cake on a scale as 450 g, to the nearest 10 g. What are the smallest and largest it could be, smallest first?

   445, 455
6. 6.

   Ren weighs a coin twice on a scale and gets 8.30 g and 8.3 g. Which measurement is more precise?

   • 8.30 g
   • They are equally precise
   • 8.3 g
7. 7.

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

   • 1.1 s
   • They are equally precise
   • 1.05 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
   • 6.35
   • 6.58
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?

   • 128
   • 155
   • 143
   • 148
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?

    • 3.4
    • 3.24
    • 3
    • 3.27