Lesson 5

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

20 square feet. Possible solution strategy: I found the area of the triangle by multiplying 2.5 × 4 = 10. Then I divided 10 ÷ 2 = 5 square feet. I added the area of the shaded area and the area of the triangle: 15 + 5 = 20 square feet.

Y. Area Problem

Peter cut a right triangle from a rectangular piece of paper.

The area of the paper left is 15 square feet. What is the area of the original piece of paper? Show how you solved this.