Times tables and their patterns
Lesson 2 of 10
Factors, multiples and primes
Objective. Find factor pairs and identify prime numbers below 100.
The key idea
A factor divides a number exactly; a multiple is what you land on when counting up in that number. A prime has exactly two factors: 1 and itself.
Practice
Each question comes with a picture and a listen button. Try it first, then reveal the answer.
Common mistake. Calling 1 a prime. It has only one factor, so it is not prime.
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