To write an equation, you turn a word story into a number sentence with an equals sign — and that builds on finding a missing number in a number sentence like □ + 3 = 7. Warm up those missing-number sentences and writing equations 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 A line of math with numbers and a sign that you can read.
Example: 3 + 4 = 7 is a number sentence.
Level 1 The unknown number that makes a sentence true.
Example: In □ + 3 = 7, the missing number is 4.
Level 1 The total you get when you add numbers.
Example: The sum of 5 + 2 is 7.
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 number makes this true? □ + 3 = 7
2. What does the equals sign (=) mean?
3. "A number plus 2 is 9." Which number sentence shows this?
Vocabulary previewed and basics checked. Time to start the lesson.
Start Lesson 7-1 →