Question

1 Solve the following –
(a) Write the first five odd multiples of 3.
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(b) Write the multiples of 13 which are greater than 50 but less than 100.
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(c) Write all the factors of 18 and 78.
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Q. 2 What is the prime factorisation of 610?
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Q. 3 Find HCF of following numbers –
(a) 54 and 90
(b) 12, 28 and 64
(c) 200 and 600
Q. 4 Find HCF of following numbers –
(a) 12 and 35
(b) 15, 45 and 90
(c ) 250 and 350
Q. 5 If the 1 cm of 27 and 130 is 3510, what is their HCF?
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Q. 6 The product of 1 cm and HCF of 2 nos is 720. If one of the number is 30, what is
the other number?
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Q. 7 Think and answer –
(a) The smallest prime number.
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(b) The greatest prime number between 1 and 100
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(c) The HCF of 6 and 7
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(d) The smallest composite number
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(e) The factors of 25.
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(f) The sixth multiple of 7
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(g) The greatest factor of 90.
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(h)The 1 cm of 8 and 9.
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(i) The prime factorisation of 18.
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(j) The HCF of any 2 consecutive numbers.
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Answer 1

Answer:

1st. 3,9,15,21,27

2nd.52,65,78,91,

3rd.

Step-by-step explanation:

it is very long can't answer