Support
Help with NDED’s Tutors, games and practice tools, and how to tell us about a problem or a math error.
Contact NDED
Email [email protected]. NDED has no accounts, so there is nothing to log in to, reset or cancel.
Choose the kind of message below to open your email app with a subject line already filled in:
Using a Tutor
How do I start?
Enter your own numbers, or choose a random problem where the Tutor offers one, then press the start button. The Tutor asks for one step at a time and checks each step before moving on.
What happens if my answer is wrong?
The Tutor tells you at that step and lets you try again. Nothing is counted against you, and there is no timer.
What does Show Me One Step do?
It fills in only the step you are on, then hands control back to you. Use it when you are stuck, then try the next step yourself. How NDED Works explains why the Tutors are designed this way.
Can I do another problem?
Yes. Change the numbers at the top and start again. The fraction Tutors also show a Try Another Problem button when you finish.
Games and practice
Times tables 2–12
Complete a table twice to unlock the next one. When you are comfortable with several tables, try Mixed Practice, which mixes facts from 2 to 12 in short rounds and brings missed facts back for review.
Game sounds
The matrix multiplication games have a sound button you can switch off. Your choice is remembered in your browser.
Where should I start?
Open a topic page, such as Multiplication, Division, Fractions or Area & Perimeter, and follow the learning path from the first step you are unsure about.
Technical problems
If a page does not load, looks broken, or a button does not respond, try these first:
- Reload the page.
- Make sure your browser is up to date.
- Try turning off browser extensions that block or change page content.
If the problem continues, email us and include:
- the address of the page,
- your device and browser (for example, “iPad, Safari”),
- what you expected and what happened instead,
- a screenshot, if you can.
Reporting a math error
Correct math matters more than anything else on NDED. If a Tutor rejects a correct answer, accepts a wrong one, or an explanation does not match the math, please tell us. It helps to include:
- the page address,
- the exact problem (the numbers you entered or were given),
- the step where it happened,
- what the tool showed, and what you expected.
General feedback
Ideas, suggestions and stories about how you use NDED with students or at home are always welcome. Send us a message.
Please do not include personal details you would not want to share. See the Privacy Policy for how emails are handled.
More about NDED
Last updated: November 2026