Cogito
Kindergarten Math · Chapter 3 · Lesson 3
Adding in Any Order
Two plus five is the same as five plus two.
10 problems · about 9 minutes · K.OA.A.2
What this lesson teaches
The child recognises that adding two numbers in either order gives the same total.
- Adding in either order gives the same total.
- The pile is the same however you say it.
- Start with the bigger number to save counting.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
4 problemsReview — Counting On: 6 + 2 = ?
Answer 8
Why Eight.
Review — 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.
Warm Up
Straightforward practice. Get the method working first.
3 problems2 + 6 = ?
Answer 8
Why Eight.
3 + 5 = ?
Answer 8
Why Start at five.
5 + 3 = ?
Answer 8
Why Same as before.
Build It Up
The same ideas with more to keep track of.
2 problems1 + 8 = ?
Answer 9
Why Start at eight.
4 + 2 is the same as 2 + ?
Answer 4
Why Just swapped.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
1 problemThe Stickers: Three stickers and six stickers. How many?
Answer 9
Why Nine.