HCF & LCM - Practice Set 2

Published on Friday, July 03, 2015
Q1. 468 can be expressed as a product of prime as a) 2×2×13×7×2×3 b) 2×2×13×7 c) 2×2×13×3×3 d) 2×2×3××7 e) None of these

Q2. A number n is said to be perfect if the sum of all its divisor (excluding n itself ) is equal to n. An example of a perfect number is:
a) 27 b) 35 c) 21 d) 6 e) None of these


Q3. 70105/21035 when expressed in simplest form is
a) 203/601 b) 2003/603 c) 2003/601 d) 2001/603 e) None of these

Q4. H.C.F. of 22×33×55, 23×32×52×7 and 24×34×72×5×11 is :
a)22×32×5
b)22×32×5×7×11
c)24×34×55
d)24×34×55×7×11
e) None of these

Q5. 52×3×24×22×32×7 Find the L.C.M.
a) 12300 b) 12600 c) 24600 d) 25200

Q6. H.C.F. of 4×27×3125, 8×9×25×27 & 16×81×5×11×49 is:
a) 180 b) 360 c) 540 d) 1260 e) None of these

Q7. The greatest 5-digit number that is exactly divisible by 100 is:
a) 99899 b) 99800 c) 99900 d) 99889 e) None of these

Q8. What will be the remainder when (29)36 is divided by 28 ?
a) 0 b) 1 c) 29 d) 5 e) Cannot be determined

Q9. A number when divided by 627 leaves a remainder 43. By dividing the same number by 19, the remainder will be
a)19 b) 24 c) 43 d) 5 e) 13

Q10. The numbers 1, 3, 5 ... 25 are multiplied together. The number of zeroes at the right end of the product is :
a) 22 b) 8 c) 13 d) 6 e) 0

Q11. When a certain number is multiplied by 21, the product consist oof only fours. The smallest such number is:
a) 21164 b) 4444 c) 444444 d) 444 e) None of these

Q12. In a question, divisor is 2/3 of the dividend and twice the remainder. If the remainder is 5, then the dividend is
a) 85 b) 145 c) 225 d) 65 e) None of these

Solution

(1)
Sol : Option (c)
221333 = 468

(2)

Sol : Option (d)

n Divisors excluding n Sum of divisor
27
3✘9✘1
13
35
5✘7✘1
13
21
3✘7✘1
11
6
3✘2✘1
6

(3)

Sol : Option (c)
(4)
Sol: Option (a)

(5)
Sol:Option (d)
50+75+150+250+350
=875

(6)
Sol: Option (a)
4✘27✘3125=23✘33✘55
8✘9✘25✘7=23✘32✘52✘7 
16✘81✘5✘11*49=24✘34✘72✘5✘11
 H.C.F. = 22✘32✘7 = 180

(7)
Sol: Option (c)

(8)
Sol: Option (b)

(9)
Sol: Option (d)

(10)
Sol: Option (e)

(11)
Sol: Option (a)

(12)
Sol: Option (e)



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