### Standard 13: Measurement

In grades 5-8, the mathematics curriculum should include extensive concrete experiences using measurement so that students can:
• Extend their understanding of the process of measurement
• Benchmarks 9A (The Mathematical World: Numbers)
Measurements are always likely to give slightly different numbers, even if what is being measured stays the same.

Benchmarks 3A (The Nature of Technology: Technology and Science)
Measuring instruments can be used to gather accurate information for making scientific comparisons of objects and events and for designing and constructing things that will work properly.

• Select appropriate units and tools to measure to the degree of accuracy required in a particular situation
• Benchmarks 1B (The Nature of Science: Scientific Inquiry)
Tools such as thermometers, magnifiers, rulers, or balances often give more information about things than can be obtained by just observing things without their help.

• Understand the structure and use of systems of measurement
• Benchmarks 9A (The Mathematical World: Numbers)
When people care about what is being counted or measured, it is important for them to say what the units are (three degrees Fahrenheit is different from three centimeters, three miles from three miles per hour).

Benchmarks 12B (Habits of Mind: Computation and Estimation)
Judge whether measurements and computations of quantities such as length, area, volume, weight, or time are reasonable in a familiar context by comparing them to typical values.

Benchmarks 11D (Common Themes: Scale)
Properties of systems that depend on volume, such as capacity and weight, change out of proportion to properties that depend on area, such as strength or surface processes.

• Develop the concepts of rates and other derived and indirect measurements
• Benchmarks 9B (The Mathematical World: Symbolic Relationships)
Mathematical statements can be used to describe how one quantity changes when another changes. Rates of change can be computed from magnitudes and vice versa..

Benchmarks 12B (Habits of Mind: Computation and Estimation)