For finding the prime numbers we write all the whole numbers from 1 to 100 in a 10-square table and then follow the following steps.

**Step 1:** 1 is a unique number, so we do not consider it.

**Step 2:** We cross out all the multiples of 2 except 2.

**Step 3:** We cross out all the multiples of 3 except 3.

**Step 4:** We cross out all the multiples of 5 except 5.

**Step 5:** We cross out all the multiples of 7 except 7.

**Step 6:** Now, we encircle all the remaining numbers except 1.

All the numbers encircle are prime numbers. Those which are crossed out are the composite numbers. 1 is a unique number.

We see that 25 numbers are prime numbers out of the first 100 numbers.

They are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97

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