2nd Grade Number Bonds Worksheet
Fill in the missing number in each number bond - sometimes a part, sometimes the whole.
- Homework
- Morning Work
- Centers
- Review
- Intervention
Download the Free Printable PDF
No sign-up required. Clean, low-ink US Letter format.
- Grade
- 2nd Grade
- Subject
- Math
- Skill
- Number Bonds
- Topic
- part-part-whole number bonds
- Difficulty
- Standard
- Time
- 10 minutes
- Pages
- 2 (incl. answer key)
- Format
- Printable PDF (US Letter)
- Answer key
- Included
- Best for
- homework, morning work, centers, review, intervention
Worksheet details
What This Worksheet Practices
Students will find the missing part or whole in a part-part-whole number bond.
- Part-part-whole thinking
- Finding a missing part (subtract)
- Finding the whole (add the parts)
Worksheet Preview
The whole is made of its parts
A number bond shows a whole split into two parts. The thinking is simple but powerful: the parts add up to the whole, and the whole minus one part gives the other. If a part is missing, you subtract; if the whole is missing, you add. This part-part-whole model is the backbone of mental math and fact families.
How to use it
Have students first ask, “Is the whole missing, or a part?” Whole missing → add the parts; part missing → subtract. Builds on missing addends and leads into fact families.
👩🏫 Teacher note
A number bond shows a whole made of two parts. If a part is missing, subtract; if the whole is missing, add the parts. This is the Singapore-math foundation for fact families and mental math.
🏠 Parent note
The big number is the whole; the two smaller numbers are the parts. Parts add to the whole, and the whole minus one part gives the other.
Common Mistakes to Watch For
- Adding the parts when the whole is what's missing... and vice versa
- Mixing up which number is the whole
Answer Key
Each answer shows the missing number.
⬇ Download Answer Key (PDF)Related Worksheets
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