Compare Lengths by Subtracting

Applied MP

MPs * Embedded MP

Conceptual Lesson Grade 2 · Unit 11· Lesson 14

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MC: 2.MD.4

Problem of the Day



Objective: Today I will determine the

of two

objects

Vocabulary Difference in length: how much longer or how much shorter one object is than the other

Standard (Customary) Units of Measurement: inch = thumb-to-knuckle length foot = 12 inches yard = 3 feet (36 inches)

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Notes Steps: 1. Measure the two objects using the appropriate tool. 2. Draw a number line and write the longest measurement on the end. 3. Starting on the longest measurement, count back to the shortest measurement. 4. Record how much longer or shorter the object is.

Metric Units of Measurement: one centimeter = width of pinky 25 centimeters = one ruler one meter = four rulers (100 cm)

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Grade 2 Unit 11 Lesson 14 C SJ

Structured Guided Practice (A / B Partners Practice) Directions: Solve the problems.

1. Ask student partners to determine who has the longer foot.

Record:

’s foot is longer by

centimeters.

’s foot is shorter by

centimeters.

2. Tell the students you want to determine how much longer the bed is than the boy who will be sleeping in it. The bed is 75 inches long. The boy’s length is 60 inches long.

Record: The bed is longer by The boy is shorter by

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inches. inches.

Grade 2 Unit 11 Lesson 14 C SJ

Final Check for Understanding (Teacher Checks Work) Directions: Solve.

1. Measure the length of a crayon in centimeters. Measure the length of your pencil in centimeters. Which one is shorter? How much shorter is it?

2. The pig is 24 inches tall. The fence around its pen is 60 inches tall. Which one is taller? How much taller is it?

Closure Recap today’s lesson with one or more of the following MP questions: MP5:

What tool did you use to help solve the problem?

MP6:

What did you need to do to ensure your answers were correct when measuring?

MP7:

What concepts or rules helped you determine how to measure each length?

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Grade 2 Unit 11 Lesson 14 C SJ

Notes

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Grade 2 Unit 11 Lesson 14 C SJ