The set follows the second grade Common Core addition standards in order. Fluency within 20 is 2.OA.2, two-digit addition and missing numbers are 2.NBT.5, word problems are 2.OA.1, adding up to four two-digit numbers is 2.NBT.6, and adding 10 or 100 and three-digit addition within 1000 are 2.NBT.8 and 2.NBT.7.
If a child gets stuck partway through, the fix is almost always one step back. Trouble with two-digit regrouping usually means the facts within 20 are not automatic yet, and trouble with three digits usually means place value needs another look with sheets 10 and 11.
Nine of the fifteen are plain black on white and download as true vector PDFs, so they print sharp and are light on ink for a class set. The other six are in color.
Addition Within 20 Quick Practice Worksheet for Grade 2
Thirty one-digit problems in columns, and every sum lands between 10 and 18. A time box and a score out of 30 sit at the top.
Timed Addition Within 20 Worksheet for 2nd Grade
2nd Grade Addition Worksheet: Two-Digit With Regrouping
Horizontal Two-Digit Addition Worksheet for Grade 2
The same skill written across the page. Twenty problems, every one regrouping, with sums from 44 to 97.
Mixed Two-Digit Addition Worksheet for 2nd Grade
Missing Number Addition Worksheet for 2nd Grade
Sixteen number sentences within 100 with a box for the missing number. Usually it is an addend, and four times it is the sum.
Addition Word Problems Within 100 Worksheet for Grade 2
Six short story problems within 100 with room to show the work. One adds three numbers and one starts with an unknown amount.
Add Three Two-Digit Numbers Worksheet for Grade 2
Add Four Two-Digit Numbers Worksheet for 2nd Grade
Add 10 and Add 100 Mental Math Worksheet for 2nd Grade
Mental Math Addition Within 1000 Worksheet for Grade 2
3-Digit Addition Without Regrouping: Grade 2 Worksheet
Horizontal Three-Digit Addition Worksheet for Grade 2
Color-Coded Place Value Addition Worksheet for Grade 2
3-Digit Addition With Regrouping Worksheet for 2nd Grade
One more thing.
If your kids finish a unit and you're not sure what to do next, our honest advice: don't move on yet. Spend a week mixing these in as warm-ups. Fluency isn't a unit, it's a habit, and the sheet that builds it is usually the one they ask to do again.

