Evaluating Expressions AK

1. $4$

2. $26$

3. $21.21$

4. $9$

5. $455$

6. $1\dfrac{1}{2}$ or $\dfrac{3}{2}$

7. $\dfrac{1}{4}$

8. $\dfrac{7}{23}$

9. $\dfrac{7}{54}$

10. $905$

11. $266.9$

12. $129$