Learn with Amar
Teaching video
A teaching recording for this chapter has not been published yet. Start with the worked example below and explore the related animations where available.
Grade 4 chapters and video availability01 · Read and understand
What you will learn
- Add fractions with the same denominator.
- Explain your method and check what the result means in the stated situation.
Before you start
Multiplication and division facts, simple fractions, place value, and basic length and area measurement.
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 ribbon uses 3/8 m for one tag and 2/8 m for another. What total length?
Why this math matters
Combine measured amounts already expressed using the same fractional unit. 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.
Add counts of the same fractional unit
PausedQuestion: Start with the question. Paused.
Question
Start with the question
A ribbon uses 3/8 m for one tag and 2/8 m for another. What total length?
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
Both lengths use eighth-metres
Their unit sizes already match.
Connect the parts
3 + 2 = 5 eighths
Add counts of the common unit.
State and check the result
3/8 + 2/8 = 5/8 m
The denominator stays eight because piece size did not change.
The result
3/8 + 2/8 = 5/8 m
The denominator stays eight because piece size did not change.
Common mistakes to catch
- Do not add equal denominators.
- Simplifying the result is a separate renaming step.
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
Find 4/9 + 2/9.
Show a hint
Count ninths.
Reveal answer and explanation
6/9 = 2/3
Six ninths can be grouped as two thirds.
Practice 2
A learner gets 5/16 for 3/8 + 2/8. What is wrong?
Show a hint
Ask whether the pieces became sixteenths.
Reveal answer and explanation
The denominator should stay 8
Adding lengths joins eighth-sized pieces; it does not cut them smaller.
Take the idea with you
Combine measured amounts already expressed using the same fractional unit.
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: Add mixed numbers and regroup
Completion is your own study record, not a test score. It stays in this browser, does not sync to another device, and can be removed by clearing browser data.