Cogito
Grade 1 Math · Chapter 2 · Lesson 5
What Does Equals Mean?
The two sides must be worth the same.
10 problems · about 12 minutes · 1.OA.D.7
What this lesson teaches
The child reads the equal sign as "the same amount as", and judges number sentences as true or false, including sentences with the total written first.
- Equals means the same amount as.
- It does not mean "the answer is next".
- The total can be written first: 9 = 6 + 3.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
4 problemsReview — Adding in Any Order: 3 + 5 = 8. So what is 5 + 3?
Answer 8
Why Swapping the parts never changes the whole.
Review — Counting On With Pictures: Start at 9. Count on 1. Where do you land?
Answer 10
Why 9 + 1 = 10.
Review — Counting On: 8 + 2 = ?
Answer 10
Why 8 + 2 = 10.
Review — Putting Groups Together: What is 4 + 2?
Answer 6
Why 4 + 2 = 6.
Warm Up
Straightforward practice. Get the method working first.
3 problemsWhat does the equals sign mean?
Answer Both sides are the same amount.
Why Equals means the same amount as. That is why 9 = 6 + 3 works too.
Is 10 = 7 + 3 true?
Answer True.
Why Both sides are 10, so it is true.
Is 6 = 6 true?
Answer True.
Why Is 6 the same amount as 6?
Build It Up
The same ideas with more to keep track of.
1 problemIs 8 = 5 + 3 true?
Answer True.
Why The total is allowed to come first.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
2 problemsIs 4 + 3 = 8 true?
Answer False. 4 and 3 makes 7.
Why Work out 4 and 3 first.
Checking Work: Is this sentence true? 3 + 4 = 7
Answer True. Both sides are 7.
Why 3 and 4 makes 7, and the right side is 7. Both sides are the same.