Question

EXERCISE 7.2
I. Write down all prime numbers less than 30.
2. Write down all prime numbers between 75 and 100.
3. Write down all the composite numbers between 20 and 30.
4. Which of the following numbers are primes and which are composite?
TOI, 102, 105, 109, 112, 113, 120, 121, 123, 127, 131.
5. Give two prime numbers whose difference is 3.
6. Write two numbers which are prime as well as odd.
7. Write two pairs of prime numbers which differ by 2.
8. Express 32 as a sum of two prime numbers. How many pairs of such prime
numbers are possible?
9. Write the smallest prime number greater than each of the following numbers:
3, 8, 25, 39, 55, 77, 84, 90.
10. Write the greatest prime number less than each of the following numbers:
5, 13, 22, 49, 55, 70, 88, 100.
II. Which of the following numbers are even and which are odd?
25, 32, 44, 49, 64, 65, 377, 181, 292, 499, 1041, 90926.
12. Find the smallest number that should be subtracted from an odd number to
make it even.
13. Without adding, tell whether the sum will be even or odd:
(a) 44 + 86 (b) 43 + 78 (c) 123 + 345
(d) 784 + 5041
COMMON FACTORS​

Answer 1

Answer:

prime no. - 71, 73, 79, 83, 89, 97,

Step-by-step explanation:

The composite numbers between 20 and 30 are: 20, 21, 22, 24, 25, 26, 27, 28, and 30.

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Step-by-step explanation: