Exploring Order in Mathematics.pptx
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Transcript of Exploring Order in Mathematics.pptx
Exploring Order in
Mathematics
Put the Cards in Order
Does Order Matter in Mathematics?
3 • 7 = 21 7 • 3 = 21
3 + 5 = 85 + 3 = 8
Commutative Property of Multiplication
Commutative Property of Addition
When order doesn’t matter:
7 – 5 = +25 – 7 = - 2
10 ÷ 5 = 2 5 ÷ 10 = .5
Changing the order yields a different answer:
The FairMs. 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.
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 =
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
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
Payroll Costs
Employees Hours Rate of Pay
5 45 $12.002 40 $15.001 40 $27.50
Does Order Matter in Mathematics?