pls answer all of them correctly
The twin prime numbers among the set of numbers are:
(a) 13 and 17 (b) 17 and 19 (c) 19 and 23 (d) 23 and 29
2 The number that is divisible by 3, 6, 9
(a) 843 (b) 846 (c)848 (d) 849
3 The number which is not a perfect number
(a) 26 (b) 496 (c)28 (d) 6
4 The number 42 expressed not as a sum of two odd prime numbers
(a) 29 + 13 (b) 11 +31 (c)2 + 40 (d) 5 + 37
5 The factor of 675 is
(a) 7 (b) 6 ( c ) 3 (d) None of these
6 A number having only two factors
(a) Twin prime (b) co prime (c)Prime (d) Composite
7 The HCF of 4,7,25 is
(a) 4 (b) 28 (c) 700 (d) 1
8 The smallest even composite number is
(a) 4 (b) 6 (c)2 (d) 8
9 The sum of prime factors of 1729
(a) 13 (b) 19 (c)12 (d) 39
ISD/WORKSHEET/MATHEMATICS/2021 – 2022 Page 2 of 3
10 The LCM of 36,72,60 is
(a) 330 (b) 360 (c)380 (d) 310
Section B
11 Write all the common factors of the following numbers
(i)36,84 (ii) 42, 60
13 Test the divisibility by 11
(i) 406839 (ii) 297144
14 Find the smallest three digit number exactly divisible by 2,5,6 2
15 HCF of two numbers is 12, their product is 4320. Find their LCM 2
16 Express the smallest four digit numbers as the product of prime
numbers
Section C
17 Test the divisibility by 8 as well as by 4
(i) 539240 (ii) 6840324
18 Find the least number which when divided by 8, 10, 16 leave the
remainder 3 in each case
19 Find the HCF of the following numbers using prime factorization
method
(i) 72, 144 and 252 (ii) 225, 1125 and5625
20 Determine the LCM of the numbers given below
(i) 48, 72 and 84 (ii) 28, 36, 45 and 60 (iii) 12, 24, 36 and 54
21 Two tankers contain 580 litres and 860 litres of oil respectively. Find the
maximum capacity of the tanker which can measure the oil of both the
tankers when used an exact number of times
22 294 blue balls, 252 pink balls, 210 yellow balls are distributed equally
among some students with none is left over. What is the biggest number
of students?
Section D
23 The sign board of a jewellery shop has three different colours red, green
and yellow showing logo, name and picture of some jewellery
respectively. Logo comes every 20 seconds, name comes every 24
seconds and picture comes every 12 seconds. All these lights were
switched on together, after how much time will all these three light up
together?
24 A physical education teacher arranged three groups of 140, 91, 63
students for the march past. Find the number of students in each row, If
equal number of students in each row.
4
25 Find the greatest number that will divide 189, 223, 347and leave
remainders 9, 3, 7 respectively.
26 When an army commander arranged to transport his battalion of
soldiers, he considered 30-seater, 40-seater and 50-seater buses. In all
the three cases, he found that 10 seats were left vacant. What is the
smallest number of soldiers in his battalion?
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