1. Rob Schupbach Problem #3
CRIN E07: Elementary Math Curriculum and Instruction
Dr. Margie Mason/Ms. Rachael Cofer
September 23, 2011
Topic: Measurement: Perimeter and Area—Grade 5 (SOL 5.8 a, b)
Expected Heuristics: Use a picture; Use logical reasoning; Use equations and
formulas
More for the Floor
Nika is selecting floor tiles for her room in her family's new house. No tiles will be
put down in the closets. Each tile is 1 foot square and costs $0.60. All the
intersecting sides of the tiles meet at right angles.
How much will the tiles cost if there are no tiles left over?
Answer: Cost: $105.60
Complete Solutions: There are 176 ft². Since each tile is 1 ft², 176 tiles are
needed.
Multiply: 176 x $0.60 = $105.60, the cost of the tiles.
Here is another way to solve the problem.
 Find the total area of the room: 15 ft x 14 ft = 210 ft².
 Find the total area of the two closets: 6 ft x 3 ft = 18 ft², the area of one
closet; 4 ft x 4 ft = 16 ft², the area of the other closet.
The total for both closets is 18 ft² + 16 ft², or 34 ft².
 Subtract: 210 ft² − 34 ft² = 176 ft² of floor space, or 176 tiles needed.
 Multiply: 176 x $0.60 = $105.60, the cost of the tiles.

2. Rob Schupbach Problem #3
CRIN E07: Elementary Math Curriculum and Instruction
Dr. Margie Mason/Ms. Rachael Cofer
September 23, 2011
Houghton Mifflin Math. (2011). Retrieved September 23, 2011, from
http://www.eduplace.com/kids/mw/g_5.html