Waldomaths is a free resource for anyone who wants to use it, and I intend to keep it that way. It does, however, cost me money to run it, and I do not have any support or sponsorship. I have a tiny income from the adverts and associate programs, but this does not cover my costs. So the time I can spend on developing the site is limited.
Could you or your institution make a small donation to Waldomaths? If you click the button above you can use any credit or debit card with PayPal. You don't have to be a member of PayPal to use their services, which are guaranteed to be secure.