CBSE Class 6 Mathematics Question 18 of 48

Prime Time — Question 19

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19
Question
How many prime numbers are there from 21 to 30? How many composite numbers are there from 21 to 30? (Page 113)
Answer

There are 2 prime numbers, (i.e., 23,29) and 8 composite numbers (i.e., 21,22, 24, 25, 26, 27, 28 and 30) from 21 to 30.
5.2 Prime Numbers Figure it Out (Page No. 114 – 115)


Source: This question is from Prime Time, Mathematics — Class 6, CBSE Board.

Key Concepts Covered

This question tests your understanding of the following concepts from the chapter Prime Time: Prime, Numbers, There, Composite, Page, Prime Time. These are fundamental topics in Mathematics that students are expected to master as part of the CBSE Class 6 curriculum.

A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Mathematics papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.

How to Approach This Question

Read the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.

Key Points to Remember

  • Always show your working steps clearly.
  • Verify your answer by substituting values back into the equation.
  • Practice similar problems from the textbook exercises.
  • Memorise important formulae and their conditions of applicability.

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