To break a number into its prime factors, you keep splitting it into smaller multiplications until every piece is prime. That runs on quick multiplication facts, knowing which numbers divide evenly, and spotting prime numbers. Warm these up and prime factorization clicks.
These are words you'll need to already know to follow this lesson — not the new words the lesson teaches. Review each one, its meaning, and the example so the new lesson makes sense from the start.
Level 1 To add the same number many times to find a total.
Example: 4 × 6 means add 4 six times to get 24.
Level 1 To split a number into equal groups with nothing left over.
Example: 5 divides 20 evenly because 20 ÷ 5 = 4.
Level 1 Two numbers you multiply together to make another number.
Example: 2 and 3 are a factor pair of 6 because 2 × 3 = 6.
Level 1 A counting number with no fraction or dot, like 0, 1, 2, 3.
Example: 7 and 12 are whole numbers.
These check the skills you'll need for this lesson — not the new lesson itself. Answer all 3, then press Show my path. No grade — it just suggests where to start.
1. What is 4 × 6?
2. Which number divides 20 evenly (no remainder)?
3. Which number is prime (only factors are 1 and itself)?
Vocabulary previewed and basics checked. Time to start the lesson.
Start Lesson 1-1 →