Oklahoma Academic Standards
OK.4.GM. Geometry & Measurement (GM)
4.GM.2. Understand angle, length, and area as measurable attributes of real-world and mathematical objects. Use various tools to measure angles, length, area, and volume.
4.GM.2.4. Choose an appropriate instrument and measure the length of an object to the nearest whole centimeter or quarter-inch.
4.GM.2.5. Solve problems that deal with measurements of length, when to use liquid volumes, when to use mass, temperatures above zero and money using addition, subtraction, multiplication, or division as appropriate (customary and metric).