Question

4. Write first five multiples of: (a) 5 (b) 8 (e) 9
5. Find all the multiples of 9 upto 100.
6. Write all the prime numbers less than 15.
7. The numbers 13 and 31 ure prime numbers. Both these numbers have same digits 1 and 3. Find
such pairs of prime numbers upto 100.
& Express the following as the sum of two odd primes.
(a) 44 (b) 36 (c) 24 (d) 18
9. Express each of the following numbers as the sum of three odd primes:
(a) 21 (b) 31 (c) 53 (d) 61
is diuisible by 5​

Answer 1

Answer:

4.

(a) 5, 10, 15, 20, 25

(b) 8, 16, 24, 32, 40

(c) 9, 18, 27, 36, 45

5. 9, 18, 27, 36, 45, 54, 63, 72, 81, 90 99

6. 2, 3, 5, 7, 9, 11, 13

7. 17 and 71, 37 and 73, 79 and 97

(a) 44 = 13 + 31

(b) 36 = 13 + 23

(c) 24 = 11 + 13

(d) 18 = 5 + 13

9.

(a) 21 is the sum of 3,5,13 which are all odd numbers.

(b) 31 is the sum of 3, 5, 23 which are all odd numbers

(c) 53 is the sum of 7, 13, 41 which are all odd numbers.

(d) 61 is the sum of 7, 13, 41 which are all odd numbers.

Step-by-step explanation: