1. Order of Operations ( ) + X - 4343 

2. The Order of Operations tells us how to do a math problem with more than one operation, in the correct order.

3. P lease E xcuse M y D ear A unt S ally This will help to you to remember the order of operations.

4. Add + Subtract - Multiply x Divide  Please Excuse My Dear Aunt Sally P E MDMD ASAS Parentheses ( ) Exponents 4 3

5. Please Excuse My Dear Aunt Sally Parentheses ( ) Always do parentheses 1 st.

6. Please Excuse My Dear Aunt Sally Exponents 4 3 Always do Exponents 2 nd.

7. Multiply x Divide  Please Excuse My Dear Aunt Sally Do multiplication and division 3 rd, from left to right.

8. Add + Subtract - Please Excuse My Dear Aunt Sally Do addition and subtraction 4th, from left to right.

9. Let’s Try Some Problems!

10. PEMDAS 3+2 3 - (9+1) 3+2 3 - 10 3+8-10 11-10 1

11. PEMDAS 3 (9+1) + 6 2 3(10)+6 2 3(10)+36 30+36 66

12. PEMDAS 4+ 10 x 2 3 -16 4+10 x 8 -16 4+ 80 -16 84-16 68

13. PEMDAS 10+7 2 -2 x 5 10+49–2 x 5 10+49- 10 59 - 10 49

14. PEMDAS 64  (9 x 3-19) 64  (27 –19) 64  8 8

15. Now let’s try substitution. Now let’s try substitution. Evaluate the following expressions when a = 3 and b = -2 1)4x + b 3 4(3) + (-2) 3 4(3) + -8 4(3) - 8 or 12 + -8 4 12 - 8 4