Q. 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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Answers
Answered by
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Answer ( 1 ) :
a) = 3, 9, 15, 21, 27
b) = 52, 65, 78, 91
c) • Factors of 18 = 18, 9, 6, 3, 1.
• Factors of 78 = 78, 39, 26, 13, 6, 3, 2, 1.
Answer ( 2 ) :
610 = 2 × 5 × 61
Answer ( 3 ) :
a) = 18
b) = 4
c) = 200
Answer ( 4 ) :
a) = 1
b) = 15
c) = 50
Answer ( 5 ) :
H.C.F = 1
Answer ( 7 ) :
a) = 2
b) = 97
c) = 1
d) = 4
e) = 25, 5, 1
f) = 42
g) = 90
h) = 72
i) = 2 × 3 × 3
j) = 1
Note :
I can't understand the 6th Question Sorry.
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