LCM & HCF-10
Authored by Pavithra naandi
Mathematics
Professional Development
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If x : y be the ratio of two whole numbers and z be their HCF, then the LCM of those two numbers is
YZ
XZ/Y
XY/Z
XYZ
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The sum of the H.C.F. and L.C.M of two numbers is 680 and the L.C.M. is 84 times the H.C.F. If one of the number is 56, the other is :
84
12
8
96
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If A and B are the H.C.F. and L.C.M. respectively of two algebraic expressions x and y, and A + B = x + y, then the value of A3 + B3
is
x^3 – y^3
x^3
y^3
x^3+ y^3
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If P = 2^3 3^10 5 ; Q = 2^5 3 7, then HCF of P and Q is :
2.3.5.7
3.2^3
2^2.3^7
2^5 3^10 5 * 7
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The HCF (GCD) of a, b is 12, a, b are positive integers and a > b > 12. The smallest values of (a, b) are respectively
12,24
24,12
24,36
36,24
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The least number to be subtracted from 36798 to get a number which is exactly divisible by 78 is
18
20
38
60
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A fraction becomes 1/6 when 4 is subtracted from its numerator and 1 is added to its denominator. If 2 and 1 are respectively added to its numerator and the denominator, it becomes 1/3. Then, the LCM of the numerator and denominator of the said fraction, must be
14
350
5
70
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