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3000
Multiply by twenty and by four, then add.
Class 5 · Bangla Version · Mathematics
Operations, factors and multiples
Explore operations, factors and multiples 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
Use place value for operations and factors for exact grouping. The least common multiple is the smallest positive number in both multiple lists.
Worked example
For 8 and 12, the least common multiple is 24. Their greatest common factor is 4.
- 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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192
Twelve times 192 equals 2304.
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24
Twenty-four is the first shared positive multiple.
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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12
Twelve divides both and no larger common factor does.
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312
14×300=4,200 and 14×12=168.
Write in your own words. A guardian or teacher should review this response.
Show model answer and explanation
2,400×6=14,400 and 7×6=42, so the correct product is 14,442.
Show which place-value part was omitted.
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