Adding Tens

30 + 40, and 34 + 20.

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

What children learn in Level 34

Adding tens is like adding small numbers. 3 plus 4 is 7, so 3 tens plus 4 tens is 7 tens: 70!
To add tens to any number, add to the tens digit. 34 plus 20: 3 tens and 2 tens make 5 tens. The 4 ones stay. 54!
Or count on by tens: start at 34, then 44, 54.
Your turn! Start with 26, and build 26 plus 30.
When you add tens, only the tens change.

Georgia's K-12 Mathematics Standards:

1.NR.5.3 — Add and subtract multiples of 10 within 100.
1.NR.5.1 — Use a variety of strategies to solve applicable, mathematical addition and subtraction problems with one- and two-digit whole numbers.