(11) Write five pairs of prime numbers less than 20 whose sum is divisible by 5. Sol: Prime numbers less than 20 are 2, 3, 5, 7, 11, 13, 17 and 19 2 + 3 = 5 (divisible by 5) 2 + 13 = 15 (divisible by 5) 3 + 7 = 10 (divisible by …
(06) Express the following as the sum of two odd primes. (a) 44 = 3 + 41 (Both 3 and 41 are odd primes)(b) 36 = 5 + 31 (Both 5 and 31 are odd primes)(c) 24 = 5 + 19 (Both 5 and 19 are odd primes)(d) 18 = 5 + 13 (Both 5 …
(1) What is the sum of any two a) Odd numbers? b) Even numbers? a) Sum of any two odd numbers is always an even number.Example: 1 + 3 = 4, 3 + 5 = 8, 5 + 7 = 12All final obtained numbers (4, 8 and 12) are even numbers. b) Sum of any …
(03) Match the items in Column 1 with the items in column 2 Solution (04) Find all the multiples of 9 up to 100. SolutionMultiples of 9 up to 100: 9 × 1 = 99 × 2 = 189 × 3 = 279 × 4 = 369 × 5 = 459 × 6 = 549 …
(1) Write all the factors of the following numbers a. 24Sol: 24 = 1 × 24, 24 = 2 × 12, 24 = 3 × 8, 24 = 4 × 6, 24 = 6 × 4, 24 = 8 × 3, 24 = 12 × 2, 24 = 24 ×1So, the factors of 24 are …