Number Bonds to 20 Worksheets
Number bonds with wholes up to 20, one circle blank in each. Teen wholes are where bonds start doing real work: 17 split into 9 and 8 is a fact most first graders do not have by heart, and the diagram makes them find it. Missing parts and missing wholes are mixed on the page.
Ready-made PDFs
One-click downloads, answer key included, a different puzzle in each.
FAQ
Are bonds to 10 included on this page?
Yes, wholes run from 2 to 20, so some bonds are within 10. For a page of only small bonds, use the number bonds to 10 page linked below.
Do the downloads include answer keys?
Yes, every PDF ends with a key page that repeats the layout with the answers in green. Turn the Answer key switch off for a problems-only file.
Can I get different versions for each student?
Turn on the 5 versions switch before downloading. You get five different sheets in one PDF, each with its own answer key, so neighbouring desks cannot copy.
Is there a version past 20?
The hard setting in the panel uses wholes to 100, which turns the diagram into two-digit addition and subtraction practice.
Can kids do these on a tablet?
Yes. Practice online puts a pen tool over the same sheet, so answers (or clock hands) can be drawn with a finger or stylus and wiped for another try.
How do I print this number bonds worksheet?
Click Download PDF and print at 100% scale. The page is already sized for US Letter with printer-safe margins, so no fit-to-page fiddling is needed.