Order and Grouping

3 + 8 = 8 + 3, and add three numbers by finding a ten.

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 26

You can add in any order. 3 plus 8 is 11, and 8 plus 3 is 11 too. So if you know one, you know the other!
That's handy: for 3 plus 8, you can start at 8 and count on 3.
When you add three numbers, you can add any two first. Look for a ten! 2 plus 6 plus 4: 6 and 4 make 10.
So 2 plus 6 plus 4 is 2 plus 10, which is 12!
Change the order or the grouping to make adding easier. The total stays the same.

Georgia's K-12 Mathematics Standards:

1.NR.2.7 — Apply properties of operations as strategies to solve addition and subtraction problem situations within 20.