National STEM Standards
STEM.M. MATHEMATICS: National Council of Teachers of Mathematics
NCTM.12. Connections to the Grade 3 Focal Points
12.2. Measurement: Students in grade 3 strengthen their understanding of fractions as they confront problems in linear measurement that call for more precision than the whole unit allowed them in their work in grade 2. They develop their facility in measuring with fractional parts of linear units. Students develop measurement concepts and skills through experiences in analyzing attributes and properties of two-dimensional objects. They form an understanding of perimeter as a measurable attribute and select appropriate units, strategies, and tools to solve problems involving perimeter.
4.1. Understand measurable attributes of objects and the units, systems, and processes of measurement.
4.1.1. Understand such attributes as length, area, weight, volume, and size of angle and select the appropriate type of unit for measuring each attribute.
4.1.2. Understand the need for measuring with standard units and become familiar with standard units in the customary and metric systems.
4.1.4. Understand that measurements are approximations and how differences in units affect precision.
4.2. Apply appropriate techniques, tools, and formulas to determine measurements.
4.2.2. Select and apply appropriate standard units and tools to measure length, area, volume, weight, time, temperature, and the size of angles.