Cogito
Kindergarten Math · Chapter 3 · Lesson 2
Counting On
A faster way to add.
10 problems · about 9 minutes · K.OA.A.2
What this lesson teaches
The child adds by counting on from the larger number.
- Start at the bigger number and count on.
- Use your fingers to keep track.
- It is much faster than counting all.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
4 problemsReview — Putting Two Groups Together: 3 + 4 = ?
Answer 7
Why Seven.
Review — 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.
Warm Up
Straightforward practice. Get the method working first.
3 problems6 + 2 = ?
Answer 8
Why Eight.
7 + 2 = ?
Answer 9
Why Eight, nine.
5 + 3 = ?
Answer 8
Why Six, seven, eight.
Build It Up
The same ideas with more to keep track of.
2 problems2 + 6 = ?
Answer 8
Why Start at six.
8 + 1 = ?
Answer 9
Why Just one more.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
1 problemThe Marbles: Seven marbles. Two more. How many?
Answer 9
Why Nine.