First, select a book for general math, either a new or used book, if not one from your local library. Use a book with examples and practice problems.
Start with addition, then subtraction. Vary the lesson time such as: using the book and then switch to time with flash cards or computer games, back to the book and then use money to count back change.
Next, you will work through multiplication and division. Have the learner make multiplication tables and work on speed with flash cards or computer games.
Now for decimals, fractions, and percentages. This is a process of learning rules while continuing to practice the addition, subtraction, multiplication, and division skills.
Spend time on negative numbers and emphasize the fact that they do relate to real life. If a person owes money, we are working with negatives, and if a diver goes below the surface, you have negatives.
Finally, the learner is ready for measurements. Use a ruler with both standard and metric markings.