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How many three-digit prime numbers can you make using each of 2,4 and 5 once?

Important Questions on Prime Time

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6th CBSE Latest Syllabus
IMPORTANT
Ganita Prakash Grade 6 Mathematics Textbook>Chapter 5 - Prime Time>Q 32
Observe that 3 is a prime number, and 2×3+1=7 is also a prime. Are there other primes for which doubling and adding 1 gives another prime? Find at least five such examples.
MEDIUM
6th CBSE Latest Syllabus
IMPORTANT
Ganita Prakash Grade 6 Mathematics Textbook>Chapter 5 - Prime Time>Q 33
Identify whether18 and 35 are co-prime?
MEDIUM
6th CBSE Latest Syllabus
IMPORTANT
Ganita Prakash Grade 6 Mathematics Textbook>Chapter 5 - Prime Time>Q 34
Identify whether15 and 37 are co-prime?
MEDIUM
6th CBSE Latest Syllabus
IMPORTANT
Ganita Prakash Grade 6 Mathematics Textbook>Chapter 5 - Prime Time>Q 35
Identify whether 30 and 415 are co-prime?
MEDIUM
6th CBSE Latest Syllabus
IMPORTANT
Ganita Prakash Grade 6 Mathematics Textbook>Chapter 5 - Prime Time>Q 36
Identify whether 17 and 69 are co-prime?
MEDIUM
6th CBSE Latest Syllabus
IMPORTANT
Ganita Prakash Grade 6 Mathematics Textbook>Chapter 5 - Prime Time>Q 37
Identify whether 81 and 18 are co-prime?
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6th CBSE Latest Syllabus
IMPORTANT
Ganita Prakash Grade 6 Mathematics Textbook>Chapter 5 - Prime Time>Q 38
While playing the ‘idli-vada’ game with different number pairs, Anshu observed something interesting!
1. Sometimes the first common multiple was the same as the product of the two numbers.
2. At other times, the first common multiple was less than the product of the two numbers.
Find examples for each of the above. How is it related to the number pair being co-prime?
HARD
6th CBSE Latest Syllabus
IMPORTANT
Ganita Prakash Grade 6 Mathematics Textbook>Chapter 5 - Prime Time>Q 39
Find the prime factorisations of the following numbers: 64, 104, 105, 243, 320, 141, 1728, 729, 1024, 1331, 1000.