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 2 chapters and video availability01 · Read and understand
What you will learn
- Group tally marks to organize a count.
- Explain your method and check what the result means in the stated situation.
Before you start
Counting and comparing whole numbers, basic addition and subtraction, and recognizing simple shapes.
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 tally record has two complete groups of five and three extra marks. What count does it show?
Why this math matters
Record each observation once using a tally before making a graph. 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.
Read tally marks in fives
PausedQuestion: Start with the question. Paused.
Question
Start with the question
A tally record has two complete groups of five and three extra marks. What count does it show?
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
5 + 5 = 10
Each crossed bundle represents five tallies.
Connect the parts
10 + 3
Include the marks outside complete bundles.
State and check the result
13 observations
Bundling makes the count easier to check than a long ungrouped row.
The result
13 observations
Bundling makes the count easier to check than a long ungrouped row.
Common mistakes to catch
- The diagonal crossing mark counts as the fifth, not an extra sixth.
- Do not ignore loose marks after full bundles.
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
How many full groups of five are in 17 tallies?
Show a hint
Separate fifteen and the remainder.
Reveal answer and explanation
3 groups, with 2 extra
3 × 5 + 2 = 17.
Practice 2
A new tally changes 14 to 15. What happens to the last group?
Show a hint
Four loose marks gain the crossing fifth.
Reveal answer and explanation
It becomes a full five-mark bundle
The count increases by one and the grouping is completed.
Take the idea with you
Record each observation once using a tally before making a graph.
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 a bar graph with a scale
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