Contact
We read every message. The fastest way to reach us is by email.
What to write about
- Report an error — please include the page address and what looks wrong. Math errors are our top priority and are usually fixed within a few days.
- Request a topic or worksheet — tell us the topic and the grade level.
- Classroom use — teachers are welcome to print and hand out our worksheets. See the Terms of Use for what is and is not allowed.
- Broken download — send the address of the PDF that will not open.
Response time
We usually reply within two to three business days. We cannot solve individual homework problems by email, but our calculators show the full method for most common question types.