Q1: The product of two numbers is 882 and their LCM is 126 . What is the HCF of these numbers?
Ans: Given that:
Product of two numbers = 882
LCM of the same numbers = 126
HCF = ?
Since we know that,
HCF x LCM = Product of the numbers
HCF x 126= 882
HCF = 882/126
HCF = 7.
Hence, the HCF is 7.
Q2: Find four common multiples of 8 and 12.
Ans: To find common multiples, we need to calculate LCM of both numbers,
Factors of both numbers are as follows:
8 = 2 × 2 × 2
12 = 2 × 2 × 3
Hence, LCM = 2 × 2 × 2 × 3
= 24
Multiples of 24 will be common multiples of 8 and 12.
Hence, four common multiples of 8 and 12 are 24 , 48 , 72 and 96.
Q3: What is L.C.M
Ans: LCM stands for least common multiple. The LCM of two numbers is the smallest number that they both divide evenly into. For example- LCM of 2 and 3 is 6.
Q4: Write the first ten multiples of 6 and 8 .Circle their common multiples.
Ans: Multiples of 6 → 6, 12, 18, 24, 30, 36, 42, 48, 54, 60
Multiples of 8 → 3, 16, 24, 32, 40, 48, 56, 64, 72, 80
Common multiples of 6 and 8, 24, 48
Q5: Write the prime factors of 120
Ans: Factors of 120 = 2 × 2 × 2 × 3 × 5
Prime factors = {2 , 3 , 5}
Q6: Give two examples of a number which is divisible by:
(a) 3 but not 9
(b) 2 but not 6.
Ans: (a) Two numbers which are divisible by 3 but not by 9 are 3, 6.
(b) Two numbers which are divisible by 2 but not by 6 are 2, 4.
Q7: Write down all the factors of the following number 75
Ans: 75 = 1 × 75
75 = 3 × 25
75 = 5 × 15
Hence the factors are 1, 3, 5, 15, 25 and 75
Q8: Write the first six multiples of: 4
Ans: Following are the first six multiples of 4
1 × 4 = 4
2 × 4 = 8
3 × 4 = 12
4 × 4 = 16
5 × 4 = 20
6 × 4 = 24
Hence multiples of 4 are 4 , 8 , 12 , 16 , 20 and 24
Q9: Fill in the blanks:
Every number is a multiple of________
Ans: Every number is a multiple of itself
Q10: Write the first six multiples of: 11
Ans: Following are the six multiples of 11
1 × 11 = 11
2 × 11 = 22
3 × 11 = 33
4 × 11 = 44
5 × 11 = 55
6 × 11 = 66
Hence, multiples of 11 are 11 , 22 , 33 , 44 , 55 and 66
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