Ask a friend or family member skilled in math to provide basic tutoring on the subject's foundational aspects, including adding, subtracting, multiplying, dividing, fractions, and percentages. Relying on your social network to provide a low-cost solution to your problem can be a mutually beneficial solution, as you will acquire the skills you need while having the chance to spend time with your loved ones.
Purchase a basic guide to mathematics at an online retailer like Amazon.com or a local bookstore. A simply structured book like Math for Dummies can help you to grasp basic concepts and provide sufficient practice material to ensure that you gain a solid understanding of math fundamentals.
Enroll in a night class or adult educational facility such as a local community college to take a basic math course. While this is perhaps the most expensive alternative, it is probably also the most effective, as it will afford you classroom instruction time with a qualified educator who is used to dealing with individuals in your situation. Financial aid might be available to cover a portion (or all) of the costs, so speak with a representative from the financial aid office to determine whether you qualify.