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Subject: Mathematics

Grade: 4th

4.MD.A.1. Know the relative sizes of measurement units within any one system of units. a. Within a single system of measurement, express measurements in a larger unit in terms of a smaller unit. b. Record measurement equivalents in a two-column table.

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1. Begin with a real-life scenario: "Imagine you’re building a doghouse, and you have a board that’s 3 feet long. How many inches is that? Why might it be helpful to know both measurements?"

Have students discuss with their neighbors then share out.

2. Show a ruler and a yardstick and ask, "How do these tools relate to each other?"

Have students share.

3. Ask students to share any times they’ve had to measure something (e.g., baking, building, crafts).

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1. Provide students pair up and provide each group with a ruler, yardstick, and measuring tape.

2. Ask students to measure the same object (e.g., their desk) in two different units: inches and feet.

3. Have students share their results and guide them to notice the relationship between the measurements (e.g., 1 foot = 12 inches).

4. Discuss why smaller units (inches) create larger numbers compared to larger units (feet).

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1. Introduce the concept of converting larger units to smaller units using multiplication. Write an example on the board:

"If 1 foot = 12 inches, how many inches are in 3 feet?"

Model the equation: 3×12=36

2. Explain the purpose of two-column tables for recording conversions. Show an example: See above

3. Have students find the pattern in the table and talk about how it can help with conversions.

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1. Give students a worksheet with measurement problems and a blank two-column table. See attached sheet.

2. Have students work in pairs to complete the problems and fill in the table.

3. Challenge students to find additional patterns in their tables (e.g., doubling, tripling).

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1. Students will solve 3 conversion problems independently and record their answers in a two-column table.

See above.

2. Circulate and provide feedback to ensure understanding.

3. Exit ticket: Have students write one sentence on the whiteboard explaining why it is useful to know how to convert units of measurement.