To solve 3x = 12, you undo the multiplication by dividing — multiplying and dividing are inverses, just like in a fact family. Warm up multiplication facts and inverse thinking and these equations are quick.
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 a set number of times.
Example: 3 × 4 = 12 means add 3 four times.
Level 1 To split a number into equal groups.
Example: 12 ÷ 3 = 4 splits 12 into 3 equal groups.
Level 1 A number you multiply by another number.
Example: In 3 × 4 = 12, the factors are 3 and 4.
Level 1 A group of times and divide facts that use the same numbers.
Example: 3 × 4 = 12 and 12 ÷ 4 = 3 are in one family.
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. If 3 × 4 = 12, which is also true?
2. What number makes 3 × □ = 15 true?
3. Check: does x = 4 make 2x = 8 true?
Vocabulary previewed and basics checked. Time to start the lesson.
Start Lesson 7-3 →