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Teaching video
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Grade 3 chapters and video availability01 · Read and understand
What you will learn
- Relate litres to millilitres and compute available capacity.
- Explain your method and check what the result means in the stated situation.
Before you start
Place value through hundreds, addition and subtraction, equal groups, and equal shares.
Keep paper nearby. Read the question once for the context, then again to identify what is known and what you need to find.
Start with a question
A jug holds 1 L. It already contains 650 mL. How much more fits?
Why this math matters
Check whether combined liquid amounts fit inside a stated container capacity. The worked example shows how to connect the situation, its mathematical representation, and a check on the result.
Set up the model
A useful answer starts with clear assumptions:
- Use the units, grouping rules, and reference whole stated in the question.
- Treat the supplied counts and measurements as exact within the classroom model, unless an estimate or a random outcome is requested.
02 · Work through the example
Follow the reasoning, one step at a time.
Try to predict the next step before reading it. After each calculation, explain why the operation makes sense and how it helps answer the original question.
Work through it with Amar
See this example unfold.
The complete worked example, one idea at a time.
Compare liquid capacities
PausedQuestion: Start with the question. Paused.
Question
Start with the question
A jug holds 1 L. It already contains 650 mL. How much more fits?
Before you calculate
Read what is known and what you need to find. Make a prediction before moving to the first calculation.
Starts paused. Play advances through the full text at a reading pace; pause whenever you need more time. Previous, Next, and the phase buttons let you set your own pace. Playback pauses when this walkthrough leaves the screen or you switch tabs.
Your device’s reduced-motion setting keeps each phase still. Manual controls remain available. The full written solution stays below.
Represent the situation
1 L = 1,000 mL
Express capacity and contents in the same unit.
Connect the parts
1,000 − 650
Subtract used capacity from total capacity.
State and check the result
350 mL more fits
650 + 350 = 1,000 mL checks the full jug.
The result
350 mL more fits
650 + 350 = 1,000 mL checks the full jug.
Common mistakes to catch
- Container capacity is the maximum, not always the current contents.
- Do not compare bare numbers with different units.
03 · Practice independently
Try it before revealing the answer.
Use paper or a calculator as needed. Write your units and reasoning, then open the hint or explanation to check your approach.
Practice 1
Two 500 mL bottles contain how many litres altogether?
Show a hint
Add the millilitres first.
Reveal answer and explanation
1 L
500 + 500 = 1,000 mL = 1 L.
Practice 2
Can 800 mL and 400 mL fit together in a 1 L jug?
Show a hint
Compare their total with one thousand.
Reveal answer and explanation
No; they exceed capacity by 200 mL
1,200 − 1,000 = 200 mL.
Take the idea with you
Check whether combined liquid amounts fit inside a stated container capacity.
04 · Reflect and continue
Can you explain it in your own words?
Before moving on, explain the main idea without looking at the worked example. Try both practice questions, check your reasoning, and name one mistake you now know how to avoid. Return to a step if you still need support.
Up next: Read repeated values in a dot plot
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