Prime number recognition. Game on.

Prime number recognition is a grade 4 math skill aligned to Common Core standard 4.OA.B.4: find all factor pairs for a whole number in the range 1–100, and recognize whether a number is prime or composite. Below are 8 practice questions with answers and step-by-step explanations, drawn from the 33 prime number recognition problems our math games drill.

CCSS 4.OA.B.433 questions in the bank

Kickoff

8 plays. No signup.

Warm-upeasy

Is $15$ prime or composite?

$15$ has factors $1\textsf{,}$ $3\textsf{,}$ $5\textsf{,}$ and $15$ , so it is composite.

Mid-gameeasy

What is the next prime after $23$ ?

$29$ .

Mid-gameeasy

Which number is prime?

$37$ has only two factors, $1$ and $37$ , so it is prime.

Mid-gameeasy

What is the smallest prime number?

The smallest prime number is $2$ .

Mid-gameeasy

What is the next prime after $19$ ?

$23$ .

Mid-gameeasy

What is the next prime number after $2$ ?

The next prime after $2$ is $3$ .

Mid-gameeasy

What is the next prime number after $3$ ?

The next prime after $3$ is $5$ .

Buzzer beatereasy

What is the next prime number after $5$ ?

The next prime after $5$ is $7$ .

Overtime

25 more. Played, not assigned.

The rest of the bank lives inside live head-to-head matches — the placement test finds the right starting difficulty.

Horseshoe TossPlay →

Drill it inside a game.

The free placement test finds your level, then every match serves prime number recognition questions at exactly the right difficulty.