Support

Digital workbook orders

Reply directly to your Lemon Squeezy receipt email. That thread is tied to your order, so it is the fastest and most secure way to have a download re-sent or a payment question resolved.

Paperback orders

Paperbacks are printed and shipped by Amazon. For delivery, returns or refunds, use Amazon order support from the order in your Amazon account.

Questions about the workbook itself

If you think an answer key is wrong or a page is missing, reply to your receipt with the workbook name, the page number and the problem number, and it will be checked against the source build.

Please never send payment-card details by email. No one from Muscle Math Mania will ask you for them.