CCSS.Math.Content.3.MD.A.2
The standard
Measure and estimate liquid volumes and masses of objects using standard units of grams (g), kilograms (kg), and liters (l). Add, subtract, multiply, or divide to solve one-step word problems involving masses or volumes that are given in the same units, e.g., by using drawings (such as a beaker with a measurement scale) to represent the problem.
Common Core State Standards for Mathematics · Measurement and Data
What this standard means
Students need to measure and estimate mass and liquid volume using grams, kilograms, and liters. They also need to solve one-step word problems with these units, using the same unit throughout. They should choose the right operation from the story, not just grab numbers.
Mastery looks like a student measuring with a scale or liter container, making a reasonable estimate, and explaining why they added, subtracted, multiplied, or divided. Common trouble spots are mixing up grams and kilograms, thinking all containers hold one liter, and missing whether a problem asks for equal groups or a comparison.
Ways to teach it
- Hands-on activity: Set up a scale station with classroom objects, estimate grams or kilograms, then measure and record the actual mass.
- Writing prompt: Explain how you know whether to add, subtract, multiply, or divide in a word problem about liters of juice.
- Quick assessment: Show a beaker drawing and ask students to find how many liters are left after some is poured out.
- Real-world connection: Use a grocery bag, rice bag, and water bottle labels to compare when grams, kilograms, and liters are used.
Plan a lesson for CCSS.Math.Content.3.MD.A.2
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