Mathematics
Answer
(i) The first six multiples of 3 are:
3 × 1 = 3, 3 × 2 = 6, 3 × 3 = 9, 3 × 4 = 12, 3 × 5 = 15, 3 × 6 = 18
Hence, the first six multiples of 3 are 3, 6, 9, 12, 15 and 18.
(ii) The first six multiples of 5 are:
5 × 1 = 5, 5 × 2 = 10, 5 × 3 = 15, 5 × 4 = 20, 5 × 5 = 25, 5 × 6 = 30
Hence, the first six multiples of 5 are 5, 10, 15, 20, 25 and 30.
(iii) The first six multiples of 12 are:
12 × 1 = 12, 12 × 2 = 24, 12 × 3 = 36, 12 × 4 = 48, 12 × 5 = 60, 12 × 6 = 72
Hence, the first six multiples of 12 are 12, 24, 36, 48, 60 and 72.
Related Questions
State whether the following statements are true (T) or false (F):
(i) The sum of three odd numbers is an even number.
(ii) The sum of two odd numbers and one even number is an even number.
(iii) The product of two even numbers is always an even number.
(iv) The product of three odd numbers is an odd number.
(v) If an even number is divided by 2, the quotient is always an odd number.
(vi) All prime numbers are odd.
(vii) All even numbers are composite.
(viii) Prime numbers do not have any factors.
(ix) Two consecutive numbers cannot be both prime.
(x) Two prime numbers are always co-prime numbers.
Write all the factors of the following natural numbers:
(i) 68
(ii) 27
(iii) 210
Write:
(i) the seventh multiple of 36
(ii) the even multiples of 9 less than 100
(iii) the odd multiples of 17 less than 150
(iv) the first 3-digit even multiple of 7
(v) the multiples of 6 between 40 and 80
(vi) the greatest 2-digit even multiple of 5
Find the common factors of:
(i) 20 and 28
(ii) 35 and 50
(iii) 56 and 120