3. 1. Substitute a number for the variable. 2. Perform all operations. 3. Simplify the result. Steps to EVALUATE AN EXPRESSION…

4. You Try It!

5. EXPRESSIONS USING EXPONENTS POWER An expression that represents repeated multiplication of the same factor. BASE The number that is multiplied into itself in an expression using exponents. EXAMPLE 81 is a power of 3 because 81 = 3*3*3*3 EXPONENT The number of times the base is used as a factor.

6. EXAMPLES

7. YOU TRY IT! 6. Nine to the fifth power 9*9*9*9*9 7. Two to the eighth power 2*2*2*2*2*2*2*2 8. N to the fourth power n*n*n*n

8. EXAMPLES SKILL CHECK 9. 8*8*8 = 512 10. 2.5 * 2.5 = 6.25 11. 1/3 * 1/3 * 1/3 * 1/3 = 1/81 or.012345679012

9. FRACTION WORK KEY When multiplying fractions, multiply STRAIGHT ACROSS, Top And Bottom. 1 * 1 * 1 * 1 3 * 3 * 3 * 3 1 81 = =

10. WORD PROBLEM PRACTICE

11. ------14----- --14--- ------14-----

12. Which way is the right way? Exponents Multiply/Divide Add/Subtract Parenthesis Exponents Multiply Divide Add Subtract P.E.M.D.A.S.

13. Evaluate what’s inside the PARENTHESIS. Evaluate all EXPONENTS from left to right. MULTIPLY and DIVIDE from left to right. ADD and SUBTRACT from left to right.

14. You Try It! 1. 20 – 16 = 4 2. 2 *9 + 4 = 18 + 4 = 22 3. 32 / 8 + 6 = 4 + 6 = 10 4. 15 + 36 - 4 = 51 – 4 = 47

15. 7 (5) = 35 24 - (9 + 1) = 24 – (10) = 14 2[30 - (21)] = 2[9] = 18

16. FRACTION WORK

17. You Try It!

18. TAKS Practice