1.)Prior to this lesson, fill a jar with items for students to estimate. (Make sure to count the items before placing them in the jar.)
2.)Give each student two sticky notes. Have them write down an estimate on one of the sticky notes and place it where no-one can see it.
3.)Read the book Betcha by Stuart J. Murphy. Allow students (within small academically diverse groups) to describe what is going on in each picture. During the story periodically ask questions, such as "What would you do to determine how many people are on a bus?" or "How could you estimate the number of cars in a traffic jam?"
4.)Allow small group discussion about strategies that were used in the story to find estimates. Ask students if anyone learned a strategy that could help them to make a more accurate estimate. If so, allow students to use the second sticky note to revise their estimate.
5.)Draw a horizontal axis on the board to place estimates. Ask questions to discover which student has the lowest and highest estimate. Fill in the horizontal axis by placing numbers at appropriate intervals on the line plot. (Example: If the lowest estimate is 18 and the highest estimate is 32, begin your line plot at 15 and label by 5's through 35.)
6.)Have each group of students take turns coming to the board to place their revised sticky note above the horizonal axis at the appropriate place.
7.)Find the range (difference between highest and lowest estimate), median (after placing all of the estimates in numerical orders locate the middle number), mode (the number occuring most frequently), and mean (the average of all estimates.)
(Mean, Median, Mode, & Range - Power Point
)This power point presentation will help students understand math terms related to data analysis.
8.)The teacher will display the exact answer for the class. The student with the closest estimate will be allowed to take the Estimation Jar home and fill it for next week's lesson. (It is a good idea to have the student take the jar home and fill it over the weekend.) Please tell the student to write the answer on a small piece of papar and tape the it inside the lid of the jar. Instruct them to keep the answer a secret until after next week's lesson and they will be allowed to help with the class lesson and reveal the answer. When the jar is returned it is a should be placed in an area that you could refer to as "Estimation Station." Students will be allowed to view (but not touch) the jar for several days before the lesson.
9.)To practice estimation skills, students may participate in the following activity:
(Glowla's Estimation Contraption
)Glowla has created this weird machine which will show you a bunch of numbers. You need to type in an estimate of what those numbers would add up to. (The secret to solving the puzzle is rounding.)