Georgia 3.MDR.5.5
The Standard
Estimate and measure liquid volumes, lengths and masses of objects using customary units. Solve problems involving mass, length, and volume given in the same unit, and reason about the relative sizes of measurement units within the customary system.
Georgia's K-12 Mathematics Standards · Solve real-life, mathematical problems involving length, liquid volume, mass, and time and analyze graphical displays of data to answer relevant questions.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students pick a sensible customary unit and tool for an object, estimate first, then measure. They solve word problems when measurements use the same unit and compare the sizes of related units.
What Mastery Looks Like
- A student selects inches for a pencil, pounds for a backpack, and cups for a small pitcher. Estimates are reasonable, measurements begin at zero, and answers include units. The student solves problems with matching units and explains that a gallon is larger than a quart.
Common Misconceptions
- Students may choose a familiar unit, such as gallons for a juice box or ounces for a heavy backpack. They may compare only the numbers and claim 12 inches is longer than 2 feet. They may start a ruler at its edge instead of zero or omit the unit from an answer.
How to Assess It
- Give each student a pencil and an exit slip. Students estimate and measure its length in inches, circle the larger unit in cup or pint, and solve 18 inches minus 7 inches.
Lesson moves
Ways to Teach It
Set up stations where students estimate, then measure classroom objects and water using rulers, scales, measuring cups, and labeled containers.
Have students write a response to this prompt: Which unit best measures a backpack's mass, ounces or pounds, and why?
Play a unit sort relay with object cards and headers for inches, feet, yards, ounces, pounds, cups, pints, quarts, and gallons.
Use a grocery receipt and container labels to create and solve questions with matching units about pounds, ounces, quarts, or gallons.
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Printable 3.MDR.5.5 Worksheet
A ready-to-print activity worksheet aligned to 3.MDR.5.5, with an answer key for the teacher on its own page. No account needed.
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