Cogito
Grade 1 Math · Chapter 2 · Lesson 1
Putting Groups Together
Join two groups and write what happened.
10 problems · about 11 minutes · 1.OA.A.1, 1.OA.C.5
What this lesson teaches
The child solves put-together and add-to stories with the result unknown, and records them as an addition equation.
- Putting groups together is adding.
- The plus sign means put together.
- The equals sign means both sides are the same.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
7 problemsReview — How Many Do You See?: How many dots?
Answer 4
Why A dice four is worth knowing by sight.
Review — One More, One Less: What is one more than 4?
Answer 5
Why One more than 4 is 5.
Review — Partners to Ten: How many more would make ten?
Answer 6
Why 4 and 6 are partners to ten.
Review — All the Ways to Make 8 and 9: 5 and what make 8?
Answer 3
Why 5 and 3 make 8.
Review — All the Ways to Make 6 and 7: 4 and what make 6?
Answer 2
Why 4 and 2 make 6.
Review — Number Bonds: The whole is 6. One part is 2. What is the other part?
Answer 4
Why 2 and 4 make 6.
Review — Five and Some More: A full five and 3 more. How many is that?
Answer 8
Why Five and 3 make 8.
Warm Up
Straightforward practice. Get the method working first.
2 problemsWhat is 4 + 2?
Answer 6
Why 4 + 2 = 6.
What is 6 + 3?
Answer 9
Why 6 + 3 = 9.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
1 problemThe Toy Box: Sam has 5 cars. He gets 2 more. How many cars now?
Answer 7 cars
Why 5 + 2 = 7.