Percentage Increase and Decrease
This 3 Act Task uses circles to help students visualize percentage increase and decrease. Students are asked to focus on drawing the result after a percentage increase or decrease vs. computing a value to first build a visual understanding of the change relative to the initial.
ACT 1
Inspiring Interest
ENGAGE
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1.
Before presenting the Act 1 video, ask students to consider the following questions as they watch:
βWhat do you notice? What do you wonder?β
βIs there anything that sticks out?β
βIs there anything that reminds you of something else?β
βWhat are you curious to know?β
2.
Present the Act 1 video.
3.
After presenting the Act 1 video, allow students to share their initial thoughts.
4.
Replay the Act 1 video and continue with the following questions:
βWhat do you think is the solution to the puzzle?β
βAre there any predictions youβd automatically rule out? Why or why not?β
βWhat additional information would help you make a more confident prediction?β
5.
After allowing students to share their initial predictions, proceed to Act 2.
ACT 2
Stimulating Thinking
ENGAGE
β
1.
Before presenting the Act 2 video, ask students to be on the lookout for new information that will help them refine their predictions.
2.
Present the Act 2 video.
3.
After presenting the Act 2 video, prompt students to consider the following questions:
βHow does this new information affect your initial prediction?β
βAre there any changes youβd like to make? Why or why not?β
4.
Give students time to finalize their predictions.
5.
Continue with the following questions:
βWhat is your final prediction?β
βWhat is the reasoning behind your prediction?β
βHow does your prediction and reasoning compare to others in the class?β
6.
After allowing students to share their final predictions, proceed to Act 3.
ACT 3
Illuminating Teacher Moves
ENGAGE
β
1.
Before presenting the Act 3 video, celebrate the process! π₯³
Remind students that regardless of whether or not their prediction turns out to be correct, everyone has already successfully completed the activity by putting their existing knowledge to work and engaging in critical thinking.
2.
Present the Act 3 video.
3.
After presenting the Act 3 video, take some time to validate studentsβ reactions.
Irrespective of whether or not their prediction is correct, students may experience a variety of emotions including, but not limited to:
Encouragement, joy, curiosity, excitement
Discouragement, frustration, confusion, and apathy
Take some time to reflect on who your students are and how you can leverage their unique personalities to guide their emotions to a place of awareness and appreciation for the learning that is taking place.
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