Square roots, cube roots and equations like x² = 49

Answer Key - Grade 8 Math Worksheet

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

1. 1.

   In math club, Bo finds √0.36. What is √0.36?

   0.6
2. 2.

   In math club, Esme finds √0.64. What is √0.64?

   0.8
3. 3.

   In math club, Jun finds ∛-27. What is ∛-27?

   -3
4. 4.

   In math club, Kira finds ∛-125. What is ∛-125?

   -5
5. 5.

   In math club, Luz finds ∛(1/8). What is ∛(1/8)?

   1/2
6. 6.

   In math club, Milo solves x² = 1/4. What are both values of x? Type them as a list.

   1/2, -1/2
7. 7.

   In math club, Noah solves x² = 0.49. What are both values of x? Type them as a list.

   0.7, -0.7
8. 8.

   In math club, Ren solves x³ = -64. What value or values of x work? Type them as a list.

   -4
9. 9.

   In math club, Zee solves x³ = 1/27. What value or values of x work? Type them as a list.

   1/3
10. 10.

    In math club, Milo finds √(16/49). What is √(16/49)?

    4/7