Cogito
Grade 1 Math · Chapter 2 · Lesson 2
Counting On
Start at one number instead of going back to one.
10 problems · about 11 minutes · 1.OA.C.5, 1.OA.C.6
What this lesson teaches
The child adds by starting at one addend and counting on, keeping track of each count.
- Start at one number and count on.
- Do not go back to one.
- Use your fingers to keep track.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
4 problemsReview — Putting Groups Together: What is 4 + 2?
Answer 6
Why 4 + 2 = 6.
Review — 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.
Warm Up
Straightforward practice. Get the method working first.
3 problems8 + 2 = ?
Answer 10
Why 8 + 2 = 10.
6 + 4 = ?
Answer 10
Why 6 + 4 = 10.
5 + 3 = ?
Answer 8
Why Hold 5. Count on three.
Build It Up
The same ideas with more to keep track of.
1 problem7 + 2 = ?
Answer 9
Why Hold 7. Count on two.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
2 problems4 + 3 = ?
Answer 7
Why Hold 4. Count on three.
At the Pond: There are 7 ducks. Then 2 more arrive. How many ducks now?
Answer 9 ducks
Why 7 + 2 = 9.