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Grade 8 - Mathematics
5.23 Number Theory Review Test

Q 1: If G.C.D. of a and b is x, then G.C.D. of ma and mb is ____ given a, b and m are natural numbers.
max
mx

Q 2: If p and q are two numbers and r is G.C.D. then L.C.M. = (p.q/r).(True/False)
True
False

Q 3: ______ is even prime number.
4
2

Q 4: 2,4,6,8,.... are divided by 2 then the remainder is _____.
1
0

Q 5: Two relatively prime numbers need not be prime numbers. (True/False)
False
True

Q 6: Dividend = Divisor * Quotient + Remainder. (True/False)
True
False

Q 7: If p is a perfect number the sum of all its factors is ____.
2p
p/2

Q 8: L.C.M. of 16, 24 and 30 is ______.
140
240

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Question 10: This question is available to subscribers only!


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