Download 4 - Multiples and Factors: Worksheet

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4 - Multiples and Factors: Worksheet
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1. Which of the following number is not divisible by 3?
(a)
3162(b)
7956(c)
5482(d)
8085
2. The prime factorisation of 88 is
(a) 2 × 2 × 11
(b) 2 × 44
(c) 2 × 2 × 22
(d)2 × 2 × 2 × 11
3. Two consecutive prime numbers whose difference is 2 is called
(a) Twin primes
(b) Co-primes
(c) Even numbers
(d)Composite numbers
4. The smallest number that is divisible by each of 9, 12 and 15 is
(a) 60
(b)90
(c) 120
(d)180
5. State ‘True’ or ‘False‘ for following statements.
(a) A factor cannot be greater than the number.
(b) Co-prime numbers are prime also.
(c) 91 is a composite number.
(d)If a number is divisible by 25, it must be divisible by 10.
6. Find the HCF of following numbers by long division method.
(a) 64, 80 and 120
(b) 154, 770 and 910
(c) 210, 420 and 540
7. Find the LCM by prime factorisation method.
(a) 93, 62, 120
(b) 121, 132, 330
(c) 112, 140, 168
8. The HCF of two numbers is 30 and their LCM is 2310. If one of the numbers is
210, find the other number.
9. Find the largest number which divides 209 and 260 leaving remainder 5 in each
case.
10. Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12
seconds respectively. After how much time, will they toll together again?
11. Two ropes of lengths 16 m and 24 m are to be cut into smaller pieces of equal
lengths. What will be the maximum length of each piece?
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