Show model answer and explanation
473
Add ones, tens and hundreds, regrouping as needed.
Class 3 · English Version · Mathematics
Written addition and subtraction
Explore written addition and subtraction with an example and your own answers.
About this lesson and its coverage
Original Kidemy foundation practice · Read the example, write your answers, then check. This starter is shared across class versions; it is not a complete board-specific lesson or course.
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Learn the idea
Line up equal place values. Regroup ten ones as one ten, or exchange a ten for ten ones when subtracting.
Worked example
248 + 135: 8 + 5 = 13 ones. Carry one ten; the total is 383.
- Read the example and explain which rule or evidence it uses.
- Try each task yourself, then compare the answer and its reason.
Your written practice
Show your working on paper. Check your answer, then choose Next.
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324
Exchange across the zero before subtracting the ones.
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135
Find the difference between 400 and 265.
Take it further
Apply the idea in a new situation and explain your method. Open writing needs a guardian or teacher to review it.
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693
Regroup thirteen ones into one ten and three ones.
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442
Exchange across the zeros before subtracting.
Write in your own words. A guardian or teacher should review this response.
Show model answer and explanation
The carried tens and hundreds were omitted. 15 ones give 1 ten and 5 ones; 6+5+1=12 tens; the total is 425.
Explain both exchanges and give 425.
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