Calculator Soup
Calculator Soup: Rule of 72 Calculator
Use the Rule of 72 to estimate how long it will take to double an investment at a given interest rate. Divide 72 by the interest rate to see how long it will take to double your money on an investment.
National Council of Teachers of Mathematics
The Math Forum: Calculating Sales Tax
Dr. Math is asked about calculating sales tax. A quick and easy to follow explanation of how it works using fractions, decimals, ratio, and percent.
BBC
Bbc: Ks3 Maths: Percentages
KS3 Math provides interactive activities on percentages, using pence and pounds. Use the factsheet for percentage information. You may use the worksheet for percentage practice and take the test provided to check your percentage skills....
Texas Instruments
Texas Instruments: Constants
Students use the calculator to determine the amount of money that will accumulate in a savings account, if every month a certain sum is deposited in the account. They explore the use of the constant function key on the calculator to make...
Texas Education Agency
Texas Gateway: Ap Macroeconomics: Appendices: Present Discounted Value
The concept of a present discounted value (PDV), which is defined as the amount you should be willing to pay in the present for a stream of expected future payments, can be used to calculate appropriate prices for stocks and bonds. To...
Texas Education Agency
Texas Gateway: Chapter 5: Comparing Gdp Among Countries
By the end of this section, you will be able to explain how GDP can be used to compare the economic welfare of different nations, calculate the conversion of GDP to a common currency by using exchange rates, and calculate GDP per capita...
Education Development Center
Tune in to Learning: Multiple Percents
Have you ever seen an item that you wanted on sale for 15% of its original price? Have you tried to figure out what the sale price would be? Using this interactive lesson from T.V. 411, you can learn to calculate discounts with percentages.
Alabama Learning Exchange
Alex: French Internet Clothes Shopping
Students practice clothing vocabulary and computer spreadsheet skills by visiting authentic French online clothing catalogs. They choose articles of clothing for purchase for themselves and family members and create a spreadsheet to...