Let’s think about what a prime number is.
A prime number is a whole number greater than 1 that can only be divided evenly by 1 and itself. That means no other numbers go into it without leaving a remainder.
For example:
- 2 is prime because only 1 and 2 divide into it.
- 3 is prime because only 1 and 3 divide into it.
- 4 is NOT prime because 1, 2, and 4 all divide into it (so it has more than two divisors).
- 5 is prime — only 1 and 5.
- 6 is not prime — divisible by 1, 2, 3, and 6.
So to define it simply:
> A prime number is a number bigger than 1 that has exactly two factors: 1 and itself.
Now, if you were to use the grid in your worksheet, you’d circle or highlight numbers like 2, 3, 5, 7, 11, 13, etc., and cross out numbers like 4, 6, 8, 9, 10, 12, etc., because they have more than two factors.
Final Answer:
A prime number is a whole number greater than 1 that has exactly two factors: 1 and itself.
Parent Tip: Review the logic above to help your child master the concept of prime numbers up to 100 worksheet.
