Lesson 7

Area Riddles

Est. Class Sessions: 1
X

Mathematical Standards

2.G.A
Reason with shapes and their attributes. (2.G.A.1, 2.G.A.2, 2.G.A.3)

Standards for Mathematical Practice

MP1.
Make sense of problems and persevere in solving them.
MP2.
Reason quantitatively.
MP5.
Use appropriate tools strategically.
MP6.
Attend to precision.
MP7.
Look for and make use of structure.

Students draw shapes consisting of whole, half, and fourth square centimeters on centimeter grids to solve riddles about area. Although designs will vary, each student's shape should have the same area.

Content in this Lesson

  • Measuring area by counting whole and fractional parts of square centimeters [E8].
  • Reporting area measurements using numbers and square centimeters [MPE6].
  • Recognizing that different shapes can have the same area [E9].
  • Using words and models to describe halves and fourths [E4].
  • Composing and decomposing shapes into smaller shapes [E6].

Daily Practice and Problems U–V

U. Halves

V. More Subtraction Practice

X

Materials for Students

Daily Practice and Problems Lesson Homework Assessment

Student Books

 Student Activity Book

Teacher Resources

 Teacher Guide - digital

Materials for the Teacher

Display of first page of Area Riddles (Student Activity Book) Page 683
Display of Centimeter Grid Paper Master (Teacher Guide)
Unit 13 Assessment Record
Math Facts Class Record
red and green crayons, optional. See Materials Preparation.
scissors, optional. See Materials Preparation.

Materials Preparation

Prepare Optional Targeted Practice. Place a copy of the first page and make copies of the second page of the Put the Pieces Together Assessment Masters from the Teacher Guide to place in a center. Have scissors and red and green crayons readily available.

Assessment in this Lesson

Assessment Expectation Assessed Math Practices Expectation Assessed
Area Questions
with Feedback Box
Student Activity Book
Pages 685–686
E8. 
Find the area of a shape on a grid using counting, repeated addition, and reasoning strategies.
E9. 
Recognize that different shapes can have the same area.
MPE6. 
Use labels. I use labels to show what numbers mean.
DPP Item V
More Subtraction Practice
Teacher Guide - digital
E10. 
Demonstrate fluency with the subtraction facts related to the addition facts in Group E (11 − 1, 11 − 10, 12 − 2, 12 − 3, 12 − 4, 12 − 5, 12 − 7, 12 − 8, 12 − 9, 12 − 10, 13 − 3, 13 − 4, 13 − 5, 13 − 8, 13 − 9, 13 − 10, 14 − 5, 14 − 9).

Vocabulary in this Lesson