## Jack and The Beanstalk Estimation

### Cheryl CarasickMarion County Schools

#### Description

Students use beans to estimate and measure the area of a shape using [Jack and the Beanstalk] to introduce this lesson.

#### Objectives

The student knows how to estimate the area and perimeter of regular and irregular polygons using graph paper, geoboard, or other objects.

#### Materials

-Paper
-Scissors
-Pencil
-Beans in a cup
-Worksheet (See Associated File)
*Optional:
[Jack and The Beanstalk] written by Richard Walker and illustrated by Niamh Sharkey. The publisher of this book is Barefoot Books, December 1999.

#### Preparations

Gather materials

Optional:
[Jack and The Beanstalk] written by Richard Walker and illustrated by Niamh Sharkey. The publisher of this book is Barefoot Books, December 1999.

#### Procedures

** Students must have a prior knowledge of the math concept of area. Read the book [Jack and The Beanstalk] or tell the story of "Jack and the Beanstalk" to introduce this lesson.

1. Review the concept of area with the students. Review using non-standard measurement. Give each child a cupful of dried beans.

2. Ask the students how many beans do they think can fit into their hands, in other words, what is the area of their hands, using beans as the measurement. Allow for guesses-realistic or not. Record two or three of them. Discuss the size of the bean, allow students to put four together and look at the size, allow students to put 10 in a line, look at the size, and then revise their estimates. Refer to the recorded guesses and ask if they seem realistic or need revision.

3. Have students trace their hands onto paper and write their own estimations on the thumbs.

4. Instruct the students to place beans onto their drawn hands, to see how many they can hold. The students get into pairs and check the number of beans the partner held.

5. Discuss results with students. Ask students what helped them make accurate estimates (seeing how long 10 beans were, seeing how big four beans grouped together were, hearing how many others thought, etc.)

6. Have students complete the attached worksheet. Tell students to use these same hints as they complete the worksheet. This worksheet assesses their ability to estimate area using beans.

#### Assessments

Monitor the students' participation during the activity. Students should be able to correctly estimate the area of their hands within 15 beans. Continue to practice with the students until they become successful. Assess students on the worksheet provided in the associated file.

#### Attached Files

Estimate Worksheet     File Extension: pdf