Prime Number Picker
Deciding whether a number is prime forces students to think in factors. Spin for a number and ask: is it prime, and how do you know? A fast, discussion-rich starter that reinforces factors and multiples along the way.
Prime Number Picker
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How to use the prime number picker
- Spin a number and ask whether it's prime or composite.
- Require a reason — a factor other than 1 and itself makes it composite.
- Watch out for tricky ones like 49, 57, and 91.
Prime Number Picker questions
What counts as a prime number?
A whole number greater than 1 with exactly two factors: 1 and itself. So 2 is prime (the only even prime), while numbers like 49 (7 × 7) are not.
Why include numbers like 91?
Because they look prime but aren't — 91 is 7 × 13. These “tricky” numbers are the best test of whether students are really checking factors.
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