1st Grade Math · Adding Within 100 Without Regrouping
Mixed addition Worksheets
Fresh practice, ready to print. Answer key included.
Both kinds on one page, still with no regrouping.
Make it yours
Or start with a ready-made version.
How it works: a quick refresher
The rules this worksheet practices, then one problem worked from start to finish.
| Strategy | How it works |
|---|---|
| Line up the places | Ones under ones and tens under tens. A one-digit number goes in the ones column. |
| Add the ones first | If the ones make 9 or less, write that digit and do not carry. |
| Then add the tens | Add the tens digits. Nothing is carried, so write that digit as it is. |
| Adding tens does not change the ones | 46 + 30 keeps the 6 ones. Only the tens digit changes: 4 tens + 3 tens = 7 tens. |
| Stay under 100 | Every sum on these pages is 99 or less. |
Worked example
Find 46 + 3.
- 1Ones: 6 + 3 = 9. That is less than 10, so write 9 and carry nothing.
- 2Tens: 4 + 0 = 4. Write 4.
- 346 + 3 = 49.
Ready-made versions
Three fixed versions you can link to or share. Each is a PDF with its own answer key.
- Mixed addition Worksheets, version 1Worksheet PDFAnswer key PDF
- Mixed addition Worksheets, version 2Worksheet PDFAnswer key PDF
- Mixed addition Worksheets, version 3Worksheet PDFAnswer key PDF
Grade level and standard
Written for 1st grade math (place value) and aligned to CCSS 1.NBT.C.4. It also works as review in later grades.
Common questions
- Is there an answer key?
- Yes. Every worksheet has a matching answer key with each answer worked on the same grid or layout as the question. The worksheet ID printed at the bottom of each page pairs a sheet with its key.
- Why does nothing on this page need carrying?
- Grade 1 builds the column habit first. Regrouping, when a column makes 10 or more, comes next, on the within-100 pages.
- Can the sum be 100 or more?
- No. Every sum is 99 or less, and no column regroups.
- How many different versions are there?
- About a million per skill. Each time you press the button the problems are generated fresh, so you can print a different version for every student, a retake, or another night of practice.
- Are the worksheets free?
- Yes. They are free to print and copy for your home or classroom, with no sign-up.