Two-Digit Plus One-Digit

42 + 5, with no new ten.

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

What children learn in Level 36

42 plus 5: add ones to the ones! 2 ones plus 5 ones is 7 ones. The 4 tens stay the same. 47!
It's like 2 plus 5, with 40 in front. Know your facts, and you can add big numbers!
Be careful not to add the 5 to the tens! 42 plus 5 is 47, not 92.
Your turn! Build 63 plus 4.
Add ones to ones. The tens stay the same.

Georgia's K-12 Mathematics Standards:

1.NR.5.1 — Use a variety of strategies to solve applicable, mathematical addition and subtraction problems with one- and two-digit whole numbers.