Cogito
Kindergarten Math · Chapter 3 · Lesson 1
Putting Two Groups Together
Adding is joining.
10 problems · about 9 minutes · K.OA.A.1, K.OA.A.2
What this lesson teaches
The child adds two groups within 10 by counting them together.
- Adding means putting groups together.
- The + sign means put together.
- The = sign says both sides are the same.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
4 problemsReview — One More, One Less: One less than 7?
Answer 6
Why Six.
Review — Comparing Written Numbers: Which is bigger, 5 or 8?
Answer 8
Why Eight.
Review — More, Fewer, the Same: Which is more, 9 or 6?
Answer 9
Why Nine.
Review — Writing Numbers: How many? ⭐⭐⭐⭐⭐⭐⭐
Answer 7
Why Seven.
Warm Up
Straightforward practice. Get the method working first.
3 problems3 + 4 = ?
Answer 7
Why Seven.
2 + 3 = ?
Answer 5
Why Count them all.
4 + 1 = ?
Answer 5
Why One more than four.
Build It Up
The same ideas with more to keep track of.
2 problems5 + 4 = ?
Answer 9
Why Count on from five.
6 + 0 = ?
Answer 6
Why Adding none changes nothing.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
1 problemThe Birds: Four birds. Three more land. How many now?
Answer 7
Why Seven.