Addition Special Types Mental Math — Set 21
12 + 37 = ___
Show answer
Answer: 49
- Operand1
- 12
- Operand2
- 37
- Operator
- +
21 + 64 = ___
Show answer
Answer: 85
- Operand1
- 21
- Operand2
- 64
- Operator
- +
3 + 20 = ___
Show answer
Answer: 23
- Operand1
- 3
- Operand2
- 20
- Operator
- +
51 + 14 = ___
Show answer
Answer: 65
- Operand1
- 51
- Operand2
- 14
- Operator
- +
31 + 21 = ___
Show answer
Answer: 52
- Operand1
- 31
- Operand2
- 21
- Operator
- +
12 + 50 = ___
Show answer
Answer: 62
- Operand1
- 12
- Operand2
- 50
- Operator
- +
8 + 11 = ___
Show answer
Answer: 19
- Operand1
- 8
- Operand2
- 11
- Operator
- +
55 + 34 = ___
Show answer
Answer: 89
- Operand1
- 55
- Operand2
- 34
- Operator
- +
57 + 32 = ___
Show answer
Answer: 89
- Operand1
- 57
- Operand2
- 32
- Operator
- +
34 + 20 = ___
Show answer
Answer: 54
- Operand1
- 34
- Operand2
- 20
- Operator
- +
35 + 44 = ___
Show answer
Answer: 79
- Operand1
- 35
- Operand2
- 44
- Operator
- +
21 + 37 = ___
Show answer
Answer: 58
- Operand1
- 21
- Operand2
- 37
- Operator
- +
12 + 100 = ___
Show answer
Answer: 112
- Operand1
- 12
- Operand2
- 100
- Operator
- +
100 + 62 = ___
Show answer
Answer: 162
- Operand1
- 100
- Operand2
- 62
- Operator
- +
31 + 51 = ___
Show answer
Answer: 82
- Operand1
- 31
- Operand2
- 51
- Operator
- +
30 + 14 = ___
Show answer
Answer: 44
- Operand1
- 30
- Operand2
- 14
- Operator
- +
31 + 35 = ___
Show answer
Answer: 66
- Operand1
- 31
- Operand2
- 35
- Operator
- +
22 + 12 = ___
Show answer
Answer: 34
- Operand1
- 22
- Operand2
- 12
- Operator
- +
18 + 21 = ___
Show answer
Answer: 39
- Operand1
- 18
- Operand2
- 21
- Operator
- +
70 + 22 = ___
Show answer
Answer: 92
- Operand1
- 70
- Operand2
- 22
- Operator
- +
Teaching Notes
Browse free addition worksheets. Each set includes an answer key and covers key skills aligned with Common Core standards.
Features
- Printable PDF format
- Answer key included
- Multiple difficulty levels
- Classroom and home friendly
How to Use These Worksheets
- Select a addition set.
- Print or use on-screen.
- Check answers and practice again.
Tips
- Start with easier sets and move up gradually.
- Practice in short sessions (10–15 minutes).
- Review mistakes and redo similar problems.
Frequently Asked Questions
What math skills are covered in these Addition Worksheets?
These worksheets cover addition worksheets skills aligned with Common Core standards for K-3 students. Each set builds procedural fluency and conceptual understanding through varied problem formats.
Are these worksheets free to print?
Yes — all worksheets are completely free with no signup required. Click Print for a clean printout optimized for US Letter paper. PDF download is also available.
What grade level are these addition worksheets for?
These worksheets are designed for Kindergarten through Grade 3 students. Topics match Common Core expectations for each grade level.
Is there an answer key?
Yes — every worksheet includes a complete answer key. Print it separately or view it on screen to check student work quickly.
Can I use these for homeschool?
Absolutely. These worksheets are widely used by homeschool families for structured math practice. The set-number system lets you assign specific worksheets and track progress.