Students learn to estimate the time it takes to travel different distances based on an estimation of the time it takes to travel a part of the whole route. This reinforces basic fractional/ratio thinking, as well as early multiplication as repeated addition. This Cyberchase activity is motivated by an episode in which the CyberSquad predicts how much air they will need to complete an underwater mission.
Part I: Learning Activity
1. Distribute the Estimating Distance and Time Handout .
2. Ask the students to complete the handout by estimating the total amount of air needed for the round trip to Crab Kingdom, based on Matt's prediction that it would take 2 minutes to go to the first landmark. Then, tell them that Matt changed his prediction to 3 minutes to go to the first landmark. Ask them to estimate again the total amount of air needed for the round trip to Crab Kingdom. In both cases, ask them to show their work.
3. Read this statement: "In the video segment we are going to watch, the CyberSquad is transporting the Grapes of Plath to the next King of Aquarium, an underwater kingdom. They are being chased by Hacker and need to wear helmets with enough air supply to reach their destination and get back safely. They estimate the amount of air they will need."
4. Ask them to think about the following questions as they watch the video: "In what way is estimating different from just guessing?" and "How do you know if you've made a good estimate?"
5. Show the Estimating Distance and Travel Time Video .
6. Discuss the students' methods for estimating, the CyberSquad's approach and the students' answers to question 4.
Part II: Assessment
Assessment: Level A: (proficiency): Students are asked to estimate the time required for various one-way and round trips along the route between Taco Valley and the Crab Kingdom, based on an initial estimate of 3 minutes per segment.
Assessment: Level B: (above proficiency): Students are given different estimates for the round trip and for a single segment of the trip, and asked to estimate the time required for a single segment, and for the entire round trip, respectively.