Unless you're a math prodigy, you probably need a calculator. HP is launching three new calculators at CES.

• The HP SmartCalc 300s scientific calculator ($14.99) has a remarkably large, muli-pixel Textbook Format Display which allows students to see math problems as they look on paper. Students can use the navigation pad to move around within an expression to change it and watch the result. The calculator has 249 built-in functions.

• The HP EasyCalc 100 ($7.99) will make a nice, light, compact calculator for a young student to carry in their backpacks. Pretty basic, but the bright blue color will make your student that much cooler.

• The HP OfficeCalc 300 ($29.99) has a special "Check and Correct" function that allows users to edit any of their last 105 entries without having to re-enter the whole problem. The calculator also has built-in functions for common business calculations like tax and percentages. <./ul>

  The calculators will be available in March through HP Home and Home Office Store, HP Small and Medium Business Store , and other retailers.