Chapter 7: Cubes and Cube Roots

Answer Key (For Teachers)

1. Answer: $5$.
   Working: $5^3=125$.
2. Answer: $-9$.
   Working: $(-9)^3 = -729$.
3. Answer: $2$.
   Working: $128=2^7$; divide by $2$ to get $2^6=(2^2)^3$.
4. Answer: $9$
   Working: $9^3$.
5. Answer: $-4$
   Working: Odd root: $-4$.
6. Answer: No.
   Working: $4^3 = 64, 5^3 = 125$.
7. Answer: $3$
   Working: $72 = 2^3\cdot 3^2$; need $3$.
8. Answer: $10$
   Working: $= 5\cdot 2$.
9. Answer: $1728$
   Working: $12^3$.
10. Answer: $0.1$
    Working: $0.1^3$.