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Real World Math

Coin counting, lottery odds, sale price and more.
Do you want to count the number of days from a start date to an end date? This page will help you count these days using a calendar.
Do you know how to read a temperature recorded on a thermometer? This solver will show you how to.
This solver will help you learn how to read time from a clock.
A weighing scale balances when the weights in the left and right pan are equal. Use this page to balance a weighing scale by adding weights to the right pan.
Need help counting U.S. coins? Have a pile of change and want to know how much money you have? This page can help.
This page will tell you how cold it feels outside, based on the fact that the wind is blowing (making it feel colder that it actually is).
This page will calculate your odds of winning. You have better chances of getting into a car accident, plane accident, or struck by lightning, than winning your lottery.
Buying a house? Car? Getting a loan? This page will help you see what your payment plan will be for repaying the loan. This is typically called an "Amortization Table." The word "Amortize" means to "break down gradually" (as in the amount of money you owe).
This page will show you how to figure the tip you should leave at a restaurant.
Is something on sale, advertised at 'so much' percent off? How much is it going to cost? This page will show you how to find out.
Simple interest is money you can earn by initially investing some money (the principal). A percentage (the interest) of the principal is added to the principal, making your initial investement grow!
Is the secret to getting rich winning the lottery? No! Compound interest and patience are!

This page will show you how your money can grow over time with compound interest. Simply fill in the blanks to the right, then click the button.

This page will show you how your retirement savings is going. Fill in the boxes, and take a look!
Look around you. What electrical device is on? Do you know much it's costing you? This page will help you to find out.