I have failed miserably in the area of mathematics for my two 16yo daughters. They are both headed to community college next year, but will need to "test in" to the highschool to college program. We've tried working together thru a basic college text, and also used Teaching Textbooks. Neither worked for them. We need to start from fractions/ decimals and move upwards. What would you suggest to get them up to speed in the next year?