Follow the liquid surface
Read liquid volume in liters and distinguish it from capacity.
Explore this lesson →12 practice questions · Optional read aloud · Thinking pad
Let’s understand the idea.
- Name the quantity first: grams (g) and kilograms (kg) measure mass; liters (L) measure liquid volume.
- Use the scale's labeled values and equal intervals. The size of an interval depends on this instrument, not on how tall the drawing looks.
- Capacity is the maximum a container can hold. Its current liquid volume may be smaller. For mass, specify whether a container is included.
- Estimate with a measured reference or a marked scale, then check the measurement. An estimate is not an exact reading.
Something to notice
Provide real calibrated mass scales and liquid containers; ask the learner to choose the unit, estimate from a reference, measure and explain the reading. Digital drawings do not validate practical measuring or handling. These lessons cover reading, estimation and reference quantities; same-unit arithmetic stories are a separate part of 3.MD.A.2. Unit conversions and geometric container-volume formulas are not required by this Grade 3 expectation.
Try it. Change it. Explain it.
Open the lesson to use its pictures and controls. In How it works, connect the picture to the idea. In Play & discover, change the quantities and notice what stays the same. In Your turn, answer questions and use the explanation to check your reasoning.
You can ask for help, draw on the thinking pad, or listen to the question and answer options. Progress distinguishes independent work from work completed with help.
Let’s try it →Curriculum connection
Grade 3 · 3.MD · US Common Core
This lesson is mapped to these standards. A completed activity is practice evidence, not a claim of mastery. Content is checked against the linked official standards and its mathematical models are tested.