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70000
Seven is in the ten-thousands place.
Class 5 · English Version · Mathematics
Large numbers and estimation
Explore large numbers and estimation 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
In a whole number, each place is ten times the place immediately to its right. Rounding chooses a nearby useful multiple.
Worked example
In 305,420, the 3 represents 300,000. Rounded to the nearest ten thousand, the number is 310,000.
- 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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680000
The thousands digit is four, so keep the lower ten-thousand.
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50000
Use twenty thousand plus thirty thousand.
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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600000
Six is in the hundred-thousands place.
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7500000
The ten-thousands digit is eight, so round up.
Write in your own words. A guardian or teacher should review this response.
Show model answer and explanation
50,000×20 is about 1,000,000. The exact factors are both a little smaller, so 947,150 is plausible.
An estimate supports the size check; it is not by itself proof of every digit.
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