To find the least common multiple of two numbers, you list each number's multiples (skip-count up) and hunt for the first one they share. That runs on multiplication facts and smooth skip-counting. Warm these up and LCM feels easy.
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 count forward by the same jump each time.
Example: Skip-count by 5: 5, 10, 15, 20.
Level 1 To add the same number many times to find a total.
Example: 3 × 4 means add 3 four times to get 12.
Level 1 To write numbers out in order, one after another.
Example: I can list jumps of 4: 4, 8, 12, 16.
Level 1 Something that is the same in two different groups.
Example: 6 is shared by the jumps of 2 and the jumps of 3.
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 3 × 4?
2. Skip-count by 5: 5, 10, 15, ___?
3. Which number is a multiple of 4?
Vocabulary previewed and basics checked. Time to start the lesson.
Start Lesson 1-3 →