Find prime numbers up to 100.
Don’t include any symbols.

🙂 = Correct, ☹️ = Incorrect

📌 Rules

• A prime number has exactly two factors: 1 and itself. Imagine sharing 7 stickers into equal piles. You can only make 1 group of 7 or 7 groups of 1, so 7 is a prime number.

• A composite number has more than two factors. Imagine sharing 12 stickers into equal piles. You can make 2 groups of 6 or 3 groups of 4, so 12 is a composite number, not a prime number.

💡 Tips

• Remember that 2 is the only even prime number because every other even number can be divided by 2. Looking back at 12, it is even and can be split into smaller equal groups, so it is not prime.

• To check if a number under 100 is prime, try dividing it by 2, 3, 5, and 7. If it cannot be shared into equal groups by any of these numbers, it is a prime number.

• Typing your answers on our platform is quick and simple using plain digits only, so there is no need to add any spaces or commas.

⚠️ Warnings

• Do not assume all odd numbers are prime. For example, 9 is an odd number, but it is not prime because 3 × 3 = 9 (it has three factors: 1, 3, and 9).

• The number 1 is not a prime number. It only has one factor (itself), but a prime number must have exactly two factors.