- 1
Choose the question types
Pick what you need from simplifying, common denominators, same-denominator addition and subtraction, different-denominator addition and subtraction, multiplying, dividing, mixed ↔ improper, fraction ↔ decimal and comparing. Choose several and they are mixed through the sheet in even proportions. The quick presets at the top set a common combination for each school year.
- 2
Set the difficulty
Choose a denominator range of 2–6, 2–12 or 2–20, decide whether mixed numbers appear and whether subtraction may give a negative answer. You can also choose whether an improper answer is rewritten as a mixed number. Either way, the answer is reduced by the greatest common divisor.
- 3
Set out the page
Choose the type size, the number of columns, how many questions go on a page and how many pages to make. An estimate of how many questions actually fit is shown as you go. Fractions are written one above the other, so a row is taller than in plain arithmetic.
- 4
Print it or save it as a PDF
The answer key follows the worksheet as separate pages. To leave it out, choose "Worksheet only" under "What to print". Changing Destination to "Save as PDF" in the print dialog gives you a file.
With fractions, a shaky earlier step blocks the next one completely. Work up in this order.
Are the answers correct?
The answer is calculated as the question is built, and then recalculated from scratch by reading only the numbers that will actually be printed. A question reaches the page only if the two agree and the answer is in simplest form. For common denominators it also checks that both answers share a denominator and that the denominator is the least common multiple. It is still generated automatically, so a quick glance before printing is worth it.
Is the answer always in simplest form?
For the four operations, simplifying, and decimal-to-fraction questions, yes — reduced by the greatest common divisor. Common-denominator questions are the exception: both fractions stay over the least common multiple, because reducing them would take you straight back to the original fractions.
Can I have simplifying questions only?
Yes. Under "Question types", leave "Simplifying" ticked and untick the rest. The same works for common denominators alone, dividing fractions alone, and so on. Choose several and they are spread evenly, so ticking all nine gives roughly the same number of each.
How is the denominator range applied?
Choose 2–6, 2–12 or 2–20 and the denominators in the questions are drawn from that range. Simplifying is the exception: the denominator of the reduced answer comes from the range and is then scaled up, so a printed fraction such as 12/18 can have a larger denominator. Common denominators that appear mid-calculation may also exceed the range.
Can questions contain mixed numbers?
Yes. Choose "Include mixed numbers" and questions such as 1 2/3 + 2 1/4 appear. The mixed ↔ improper type uses mixed numbers regardless of the setting. The fraction part of a mixed number is always proper — though in same-denominator addition, subtraction and comparing, a part such as 1 2/4 that could still be reduced may appear, which doubles as simplifying practice.
Can subtraction give a negative answer?
With "No negatives", the operands are swapped so the larger fraction always comes first and no answer is negative. That is the right setting for primary school. Switch to "Allow negative answers" and questions such as 1/4 − 2/3 = −5/12 appear, which suits work on integers and rational numbers.
Which denominators appear in fraction-to-decimal questions?
Only ones that terminate — denominators whose only prime factors are 2 and 5, that is 2, 4, 5, 8, 10, 16 and 20, within the range you chose. Fractions such as 1/3 or 2/7 that never terminate are not used. Decimal-to-fraction questions are limited to answers whose denominator falls inside your range.
How do you answer a comparing question?
Write >, < or = in the ○ between the two fractions. Finding a common denominator, or converting to decimals, both work. Pairs of equal value such as 1/2 and 2/4 turn up now and then, so it is good practice for actually doing the comparison instead of guessing that they differ.
Could a question have a denominator of 0?
No. Denominators are always drawn from 2 upwards, and in division the numerator of the divisor can never be 0. The answer function also refuses to produce a result when a denominator is 0 and the question is discarded. Divisions whose answer is 1 — dividing a fraction by itself — are left out too, as they teach nothing.
Can I reprint exactly the same worksheet?
Type anything you like into "Worksheet key (seed)". With the same settings and the same key you get the identical sheet back. The key is printed in small type at the bottom, which is handy when a child loses their copy.
What is the difference between sets A and B?
Same conditions, different numbers. The question types and the denominator range are identical, so the difficulty matches, but neighbours cannot copy each other. Each set gets its own answer key.
Can I get it as a PDF?
Yes. Press "Print / save as PDF" and change Destination to "Save as PDF" in the print dialog (on a Mac, use the PDF menu). The text stays real text, so the file is small and easy to send on.
Does it work offline?
Yes. There is not a single external library, so once the page has loaded it works with no network. Generating and printing both happen entirely in the browser.
Is anything I type stored?
No. Everything happens inside your browser and nothing is sent to a server. Closing the page discards the title and class name you entered.