Free preview Factors and multiples

Prime and composite numbers

▶ Prime numbers

Prime numbers are numbers that have only 2 factors: 1 and themselves. For example, the first 5 prime numbers are 2, 3, 5, 7, and 11. By contrast, numbers with more than 2 factors are call composite numbers.

⏱ 8:13 💾 5.9 MB License: cc-by-nc-sa Streaming via CDN

▶ Recognizing prime and composite numbers

Can you recognize the prime numbers in this group of numbers? Which are prime, composite, or neither?

⏱ 4:40 💾 3.2 MB License: cc-by-nc-sa Streaming via CDN

← Previous lesson Next lesson →

Enjoying the free preview?

Lessons after number 3 are reserved for Pro members — unlock the full course and every other one.