Prime Numbers - Prime Numbers 1 to 100, Examples | Prime Numbers List - Free Printable

The image shows a Sieve of Eratosthenes grid from 1 to 100. The numbers that are NOT crossed out (the blue circles) are the prime numbers.

Let’s list them carefully by going row by row:

Row 1: 2, 3, 5, 7
Row 2: 11, 13, 17, 19
Row 3: 23, 29
Row 4: 31, 37
Row 5: 41, 43, 47
Row 6: 53, 59
Row 7: 61, 67
Row 8: 71, 73, 79
Row 9: 83, 89
Row 10: 97

Now let’s count them:

Row 1: 4 numbers
Row 2: 4 → total 8
Row 3: 2 → total 10
Row 4: 2 → total 12
Row 5: 3 → total 15
Row 6: 2 → total 17
Row 7: 2 → total 19
Row 8: 3 → total 22
Row 9: 2 → total 24
Row 10: 1 → total 25

So there are 25 prime numbers between 1 and 100.

Final Answer:
25