Calculators are required in most advanced math courses--even in many high schools. Though the new models are typically very expensive, cheap calculators can be found that can help you get through the classes you need. If you're in high school, college, or just enjoy math, a cheap graphing calculator is indispensable. Texas Instruments is one of the leading manufacturers of graphing calculators. These handheld computers allow you to plot points on a graph and write out long equations that were previously unable to be solved with a calculator. Any math class at or above the level of trigonometry or pre-calc will require a calculator that can deal with trigonometric functions, multiple variables, and graph equations of any order. Cheap calculators are easily available used. Students who have completed their math courses will often put their fairly new calculators up for sale when they don't need them for homework any more. Also, each year a new calculator model comes out with only a few new features, so you can pick up last year's model at low costs and not lose major functionality. Graphing calculators aren't the only cheap calculators on the market. Every home can use a basic calculator to help pay the bills, balance checkbooks, and work out simple math problems. Solar powered calculators run off of light power, don't require batteries, and will last you years and years. These cheap calculators are the perfect kind to keep around the house for those moments when you need to verify a calculation. | 
