The purpose of this Warm-up is to get students to reason about representing a context about distance as an expression. For students who use the equation d=rt to choose their answer, encourage them to explain how each part of the expression matches the context (MP3).
Give students 2 minutes of quiet work time, and follow that with a whole-class discussion.
A car is driving toward home at 0.5 miles per minute. If the car is 4 miles from home at t=0, which of these expressions can represent the distance that the car has left to drive?
4−0.5t represents the distance the car has left to drive toward home. Because 0.5t represents the distance traveled toward home, subtracting that from the 4 miles the car is from home will give us the distance left to drive.
Invite students to share their selections and to explain their reasoning. After each explanation ask the rest of the class if they agree or disagree and how the context is represented in the expression.
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The purpose of this Warm-up is to get students to reason about representing a context about distance as an expression. For students who use the equation d=rt to choose their answer, encourage them to explain how each part of the expression matches the context (MP3).
Give students 2 minutes of quiet work time, and follow that with a whole-class discussion.
A car is driving toward home at 0.5 miles per minute. If the car is 4 miles from home at t=0, which of these expressions can represent the distance that the car has left to drive?
4−0.5t represents the distance the car has left to drive toward home. Because 0.5t represents the distance traveled toward home, subtracting that from the 4 miles the car is from home will give us the distance left to drive.
Invite students to share their selections and to explain their reasoning. After each explanation ask the rest of the class if they agree or disagree and how the context is represented in the expression.