Q. 34.5( 41 Votes )
Match the items in column 1 with the items in column 2:
Column 1 Column 2
(i) 35 (a) Multiple of 8
(ii) 15 (b) Multiple of 7
(iii) 16 (c) Multiple of 70
(iv) 20 (d) factor of 30
(v) 25 (e) factor of 50
(f) factor of 20
Rate this question :
The number of common prime factors of 75, 60, and 105 isNCERT - Exemplar Mathematics
A number is divisible by 5 and 6. It may not be divisible byNCERT - Exemplar Mathematics
Express each of the following numbers as the sum of three odd primes:
(a) 21 (b) 31
(c) 53 (d) 61NCERT - Mathematics
In which of the following expressions, prime factorisation has been done?
(a) 24 = 2 × 3 × 4
(b) 56 = 7 × 2 × 2 × 2
(c) 70 = 2 × 5 × 7
(d) 54 = 2 × 3 × 9NCERT - Mathematics
Find all the prime factors of 1729 and arrange them in ascending order. Now state the relation, if any; between two consecutive prime factors.NCERT - Mathematics
Find first three common multiples of:
(a) 6 and 8 (b) 12 and 18NCERT - Mathematics
Which of the following statements are true?
(a) If a number is divisible by 3, it must be divisible by 9.
(b) If a number isd divisible by 9, it must be divisible by 3.
(c) A number is divisible by 18, if it is divisible by both 3 and 6.
(d) If a number is divisible by 9 and 10 both, then it must be divisible by 90.
(e) If two numbers are co-prime, at least one of them must be prime.
(f) All numbers which are divisible by 4 must also be divisible by 8.
(g) All numbers which are divisible by 8 must also be divisible by 4.
(h) If a number exactly divides two numbers separately, it must exactly divide their su,
(i) If a number exactly divides the sum of two numbers, it must exactly divide the two numbers separately.NCERT - Mathematics
Write five pairs of prime numbers below 20 whose sum is divisible by 5.NCERT - Mathematics