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Grade 2 Math · World 3: Hundred Harbor · Level 23
Add Tens
Add tens to any number: 34 + 20.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 23
- Let's add tens! Here's 34 plus 20.
- Put the tens together: 3 tens and 2 tens make 5 tens. The 4 ones stay the same. That's 54!
- On a number line, hop by tens: 34, 44, 54.
- Your turn! Start at 47 and tap to hop by tens 3 times.
- 47 plus 30 is 77. Adding tens only changes the tens digit!
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.