To evaluate an expression, you put a number where the letter is, then follow the order of operations. So this lesson runs on substituting a value into a blank and doing multiply/add in the right order. Warm those up first.
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: 2 × 4 means add 2 four times: 2 + 2 + 2 + 2 = 8.
Level 1 To put numbers together to find how many in all.
Example: 5 + 3 = 8.
Level 1 To put a number in place of an empty box or shape.
Example: If the box ▢ = 6, then ▢ + 2 becomes 6 + 2.
Level 1 The rule that says do × and ÷ before + and −.
Example: In 2 + 3 × 4, multiply first: 3 × 4 = 12, then 2 + 12 = 14.
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 the box ▢ = 4, what is ▢ + 3?
2. If ▢ = 5, what is 2 × ▢?
3. Which do you do first in 2 + 3 × 4?
Vocabulary previewed and basics checked. Time to start the lesson.
Start Lesson 6-2 →