Easy
6 practice items, with a separate answer key.
Download PDFNumber bond worksheets
Find the missing part that makes the target total.
Choose a ready-made starting point.
Three printable versions, made for different amounts of practice.
Standard
12 practice items, with a separate answer key.
Download PDFChallenge
20 practice items, with a separate answer key.
Download PDFWhat this page practices
Find the missing part that makes the target total.
1.OA.C.6: Add and subtract within 20, building fluency within 10.
Practice supports the cited skill; the worksheet does not cover every aspect of the full standard. Read the source standard.
A useful way to practice
- Use counters for the target total of 10. Split them into two parts, cover one part and find what is missing.
- For an early learner, work on a few items together and use objects or spoken examples. Stop before the practice becomes tiring.
- Print at 100% scale and check that the paper size matches the PDF.
More practice, when you need it.
A few things before you print.
Are these worksheets free?
Yes. Create and download as many worksheets as you need for personal or classroom practice. No account or email address is required.
Can I include an answer key?
Yes. Select Include answer key to add a separate page with answers. You can also download the answer key on its own.
Can I print on A4 paper?
Yes. Choose A4 before downloading. Both A4 and US Letter layouts use printer-safe margins. Print at actual size, or 100%, in your PDF viewer.
How do I get a different set of questions?
Use New problems to change the seed. Keep the same seed and settings when you need to reproduce a page.
How should I choose the grade?
Grade labels are starting points. For an early learner, work on a few items together and use objects or spoken examples. Stop before the practice becomes tiring.
Can I use these in my classroom?
Yes. Print and share the original practice pages with your learners. The standard references describe the skill being practiced and do not replace your lesson planning.
Original worksheets. Sources & licenses. Updated 2026-10-02.