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
- Represent three-digit numbers with hundreds, tens, and ones.
- 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 school has 2 hundred-boxes, 3 ten-packs, and 6 loose clips. How many clips?
Why this math matters
Count a large collection efficiently by packing ones into tens and tens into hundreds. 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.
Bundle ten tens into a hundred
PausedQuestion: Start with the question. Paused.
Question
Start with the question
A school has 2 hundred-boxes, 3 ten-packs, and 6 loose clips. How many clips?
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
2 hundreds = 200
Each hundred-box contains ten groups of ten.
Connect the parts
3 tens = 30; 6 ones = 6
Use each place's unit.
State and check the result
200 + 30 + 6 = 236 clips
The digits show two hundreds, three tens, and six ones.
The result
200 + 30 + 6 = 236 clips
The digits show two hundreds, three tens, and six ones.
Common mistakes to catch
- A digit's value depends on its position.
- A hundred is ten tens, not ten ones.
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
What is the value of 4 in 452?
Show a hint
Read the hundreds place.
Reveal answer and explanation
400
Four hundreds contribute four hundred.
Practice 2
How many ten-packs make one hundred?
Show a hint
Count tens to one hundred.
Reveal answer and explanation
10
10 × 10 = 100.
Take the idea with you
Count a large collection efficiently by packing ones into tens and tens into hundreds.
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: Write a number in expanded form
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