| M5 Home Page |
| Interactive Mathematics | Addition |
| MathGuide | Addition |
| Mrs. Glosser | Lesson on Addition of Integers |
| Teach-nology | Complete Addition Chart |
| The Math Page | Add Whole Numbers/Add Decimals |
| The Math Page | More Elementary Addition |
| Colby Community College | Addition Table |
| Fact Monster | Addition Table |
| Go Math | Addition Table Practice Sheet |
| Math Forum | What is a Magic Square? |
| Math Forum | Magic Squares |
| Room 108 | Carrying Over |
| Room 108 | Visual Addition Applet |
| A+ Math | Addition Hidden Picture Game |
| EMR | 1-digit Addition Flashcards |
| The Math Page | Elementary Addition |
| BasketMath Interactive | Addition |
| By the Numbers | Addition of Whole Numbers |
| EMR | 2-digit Addition Flashcards |
| EMR | 3-digit Addition Flashcards |
| Math Fact Café | Mixed Addition (2-digit to 1-digit) #1 |
| Math Fact Café | Mixed Addition (2-digit to 1-digit) #2 |
| Math Fact Café | Mixed Addition (2-digit to 1-digit) #3 |
| Kidport | Addition: 2-digit Numbers |
| Math Fact Café | Mixed Addition (2-digit to 2-digit) #1 |
| Math Fact Café | Mixed Addition (2-digit to 2-digit) #2 |
| Math Fact Café | Mixed Addition (2-digit to 2-digit) #3 |
| Math Fact Café | Mixed Addition (3-digit to 2-digit) #1 |
| Math Fact Café | Mixed Addition (3-digit to 2-digit) #2 |
| Math Fact Café | Mixed Addition (3-digit to 2-digit) #3 |
| Kidport | Addition: 3-digit Numbers to 500 |
| Math Fact Café | Mixed Addition (3-digit to 3-digit) #1 |
| Math Fact Café | Mixed Addition (3-digit to 3-digit) #2 |
| Math Fact Café | Mixed Addition (3-digit to 3-digit) #3 |
| A+ Math | MATHO Addition Game |
| Kidport | Addition: 6-digit Numbers |
| The Math Page | Mental Arithmetic: Addition - Problems |
| The Math Page | Add Whole Numbers/Add Decimals - Problems |
| Utah State University | Circle 99 |
| BlackDog | BlackDog's Math Flash Card Quiz Games |
| Gamequarium | Addition Games |
| Math Fact Café | Addition |
| Room 108 | Adding |
| TLS Books | Dinosaur Addition |
| TLS Books | Add the Shapes |
| TLS Books | Writing Addition Problems |
| TLS Books | Patchwork Giraffe |
| TLS Books | Secret Code Math |
| Math Playground | Addition with Totals of 0 to 20 Horizontal |
| The Math Work Site | Addition: Single-Digit, Horizontal |
| TLS Books | Addition to Twenty |
| TLS Books | Math Practice Series Worksheet #1 |
| TLS Books | Math Practice Series Worksheet #2 |
| TLS Books | Math Practice Series Worksheet #3 |
| TLS Books | Math Practice Series Worksheet #4 |
| TLS Books | Addition Worksheet #1 |
| Math Playground | Addition with Totals of 0 to 20 Vertical |
| Teach-nology | Addition: Single Digits - 1 |
| Teach-nology | Addition: Single Digits - 2 |
| Teach-nology | Addition: Single Digits - 3 |
| The Math Work Site | Addition: Single-Digit, Vertical |
| The Math Work Site | Addition: 5-minute Drill |
| TLS Books | Addition Worksheet #3 |
| TLS Books | Addition Worksheet #4 |
| SCWeb4Free | Addition with Numbers 0-6 |
| SCWeb4Free | Addition with Numbers 0-10 |
| RHL School | 2 Digit Addition Without Carrying |
| SCWeb4Free | Addition with Numbers 0-20 |
| SCWeb4Free | Addition with Numbers 0-30 |
| RHL School | 2 Digit Addition With Carrying |
| SCWeb4Free | Addition with Numbers 0-100 |
| SCWeb4Free | Column Addition |
| Teach-nology | Addition: Double Digits - 1 |
| Teach-nology | Addition: Double Digits - 2 |
| Teach-nology | Addition: Double Digits - 3 |
| TLS Books | Addition Worksheet #5 |
| TLS Books | Addition Worksheet #6 |
| TLS Books | Math Squares (1) |
| TLS Books | Math Squares (2) |
| RHL School | 3 Digit Addition |
| SCWeb4Free | Addition (1-3 Digits) Version 1 |
| SCWeb4Free | Addition (1-3 Digits) Version 2 |
| SCWeb4Free | Addition (1-3 Digits) Version 3 |
| SCWeb4Free | Addition (1-3 Digits) Version 4 |
| Teach-nology | Addition: Triple Digits - 1 |
| Teach-nology | Addition: Triple Digits - 2 |
| Teach-nology | Addition: Triple Digits - 3 |
| TLS Books | Addition Worksheet #7 |
| A+ Math | Addition Worksheets |
| Math Playground | Addition: 2 to 4 Digits and 2 to 4 Addends |
| Mr. LeMieux | Addition Worksheet Generator |
| The Math Work Site | Addition: Multiple Digits |
| WebMath | Basic Math Worksheets |
| BlackDog | BlackDog's Addition Worksheets |
| EdHelper | Addition Worksheets |
| His Praise | Math Facts |
| KidZone | Index of Addition Worksheets |
| KidZone | Winter Olympics Themed Worksheets |
| KidZone | Free Grade One Printable Math Worksheets |
| S&S Software | Whole Number Addition Worksheets |
| School Express | Addition Worksheets |
| SuperKids | SuperKids Math Worksheet Creator - Addition |