Subtraction Within 20 Worksheet Generator
Every item keeps the minuend at 20 or below and never produces a negative answer. The challenge level includes missing subtrahends, which are usually harder than they look.
Print at 100% for exact sizing. Choose “Save as PDF” in the print dialog for a digital copy. Free sheets include 3 prints per day; everything on the sheet is generated in your browser.
What this sheet practices
Every item keeps the minuend at 20 or below and never produces a negative answer. The challenge level includes missing subtrahends, which are usually harder than they look.
Errors worth watching for
- Subtracting the smaller digit from the larger one regardless of order (14 − 8 answered as 8 − 4).
- Counting backward and skipping a number.
How to use it
- Set the difficulty. Easy narrows the range; challenge adds missing values or extra steps.
- Choose how many questions and how many fit on a page. Ten per page is the most readable default.
- Print, or save as PDF. Replace any single question with the circular arrow if it does not fit your group.
At a glance
About this generator
Why do some answers repeat?
The range is small and every answer must be non-negative. Repeated answers are normal in early subtraction.
How can I make it concrete?
Use ten counters, cover some, and ask how many are hidden. That is the same operation in physical form.
Can I print this worksheet on A4 paper?
Yes. Switch Paper to A4 in the settings panel. The layout recalculates the page height and keeps 0.5-inch margins, so nothing is cut off.
Is an answer key included?
The generator always produces an answer key and worked solutions. They are part of the pass; the student sheet can be previewed and printed for free.