1. Exploring Order in Mathematics

3. Add Mentally 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 10

4. Does Order Matter in Mathematics? 3 7 = 21 7 3 = 21 3 + 5 = 8 5 + 3 = 8 Commutative Property of Multiplication Commutative Property of Addition When order doesn’t matter: 7 – 5 = +2 5 – 7 = - 2 10 ÷ 5 = 2 5 ÷ 10 =.5 Changing the order yields a different answer:

5. The Fair Ms. Delores is taking her children and grandchildren to the fair. Tickets to get in cost $4 each. She paid for 5 grandsons, 2 daughters, and herself. How much did Ms. Delores spend on her grandchildren’s tickets? Write an equation and show or explain how you solved the equation. Using the two equations you already wrote, write a new equation that gives the total amount Ms. Delores paid for tickets to go into the fair. How much did Ms. Delores spend on adult tickets? Write an equation and show or explain how you solved the equation.

6. Weekend Laundry I’m doing laundry. I discover $4 in each of three girls’ pockets. The next day, I find $5 in each of 2 different pockets in my husband’s clothes. 3 4 + 2 5 =

7. Pay-Day Shopping Splurge Daijah-Tae went shopping. She bought a scarf for $15, two lip glosses for $7 each, and a cell phone case for $10. 15 + 2(7) + 10

8. Buffet Hot food is $7 per pound and salads are $4.50 per pound. You buy 5 pounds of hot food, 2 pounds from the salad bar, and three waters that are $1 each. 5 7 + 2 4.5 + 3 1

9. Car Price $21,000 Sales Tax is 6% Dealer Rebate is $1,000 In the end, how much will you pay for your new car? New Car

10. Payroll Costs EmployeesHoursRate of Pay 545$12.00 240$15.00 140$27.50

11. Does Order Matter in Mathematics?