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**In This Unit of Study…**

Students will become acquainted with benchmark units of measurement so they can estimate lengths to the nearest inch, foot, yard, centimeter, and meter. After estimating the length of an object, students will identify appropriate measurement tools and units for obtaining accurate measurements. When measuring objects with two different units, students will recognize that fewer of the larger units are required. They will also measure the length of two objects, using the same unit, and they will determine how much longer or shorter one object is than another. Students will also solve one- and two-step real-world measurement problems involving addition and subtraction of lengths given in the same unit. They are not expected to convert measurements.

**B.E.S.T. Benchmarks:**

- MA.2.M.1.1
- MA.2.M.1.2 Measure the lengths of two objects using the same unit and determine the difference between their measurements.
- MA.2.M.1.3 Solve one- and two-step real-world measurement problems involving addition and subtraction of lengths given in the same units.

**Key Concepts:**

- I can estimate and measure the length of an object to the nearest inch, foot, or yard by selecting and using the appropriate tools, such as rulers and tape measures.
- I can estimate and measure the length of an object to the nearest centimeter or meter by selecting and using the appropriate tools, such as rulers and tape measures.
- I can see that rulers and tape measures are number lines.
- I can recognize that when an object is measured in two different units, fewer of the larger units are required.
- I can estimate the size of an object by comparing it with an object of known size.
- I can measure the lengths of two objects using the same unit to determine the difference between their measurements.
- I can use addition and subtraction within 100 and related differences to solve one- and two-step real-world measurement problems involving lengths that are given in the same units.