Friendly Numbers

Change to an easier problem: 49 + 26 = 50 + 25.

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

What children learn in Level 27

Some numbers are friendlier than others. 50 is a lot friendlier than 49!
49 needs just 1 more to make 50. So take 1 from the 26.
Now the problem is 50 plus 25. That's easy: 75! Nothing was added or lost, so 49 plus 26 is 75 too.
On a number line: hop 1 to the friendly 50, then 25 more to 75.
Try 38 plus 27. 38 needs 2 to make 40. 27 minus 2 is 25. 40 plus 25 is 65!

Georgia's K-12 Mathematics Standards:

2.NR.2.4 — Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.