standard_description: Apply properties of operations as strategies to add and subtract. (Students need not use formal terms for these properties.) Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)
problem_activity: Problem 1
Claudia is redecorating her bedroom, which is in the shape of a rectangle that is 8 feet long and 9 feet wide. She needs to buy new carpeting and wants to put baseboards around the border of her bedroom.
a.   How much carpeting should Claudia order?
b.   How much baseboard should Claudia order?
Problem 2
The length of a rectangle is 6 cm and its perimeter is 16 cm. What is the area of the rectangle in square centimeters?


aligns: no