Unit 3, Lesson 9
From Feet to Inches
Grade 2
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The purpose of this Estimation Exploration is for students to practice the skill of estimating a reasonable length based on their experience and known information. They are given an illustration of a boy and a fish and are asked to give an estimate for the length of the fish in inches. This gives students an opportunity to share a mathematical claim including the assumptions they made when interpreting the image with limited information (MP3, MP4). After students are given more information, they have an opportunity to revise their estimates.
This is the first time students experience the Estimation Exploration routine in grade 2. Students are familiar with this routine from a previous grade, however, they may benefit from a brief review of the steps involved.
How long is this cobia fish? Use inches.
| too low | about right | too high |
|---|---|---|
| too low | about right | too high |
|---|---|---|
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to see where instructional routines fit in your journey.
The purpose of this activity is to introduce the foot as a U.S. unit of length. Students learn that a foot is longer than an inch and is the same length as 12 inches. They use the length of 12-inch rulers as a tool to measure lengths in feet by iterating the length of a ruler. Iterating lengths of a ruler to measure in feet helps students build a mental benchmark for the approximate length of a foot that they can use to estimate lengths.
Students measure lengths of tape that represent realistic lengths of different types of fish. They measure each length to the nearest inch and to the nearest foot. In the Activity Synthesis, students discuss the difference in their measurements and relate the differences to the size of the length units (MP7).
Work with your group. Measure the tape strips around the classroom. Use feet. Then measure the length in inches.
Tape A
largemouth bass
Length in feet: __________ ft
Length in inches: __________ in
Tape B
spiny dogfish shark
Length in feet: __________ ft
Length in inches: __________ in
Tape C
catfish
Length in feet: __________ ft
Length in inches: __________ in
Tape D
koi
Length in feet: __________ ft
Length in inches: __________ in
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