Pennies, nickels, dimes and quarters: can you count them? Can you give change? Money-counting skills require practice, and these online money-counting games make it fun.
"How much money is here?" Aplusmath's interactive money-counting flash cards present one problem at a time, using dollar bills, quarters, dimes, nickels and pennies.
"Can you choose coins that add up to an amount of money?" As coins fall from the top of the screen, click on them to reach your goal.
This time you earn money in a virtual piggy bank by calculating change.
Count the various coins, and enter your answer on the calculator using your keyboard or your mouse.
Vary the difficulty of this exercise by selecting how many coins and bills to count (three to eight) and the largest denomination you want to include (from a quarter up to a twenty-dollar bill.
An integer (greater than one) is prime if the only whole numbers it can be divided by (without a remainder) are itself and one. All other integers are composite. In other words, a prime number has only two positive factors. Composite numbers have more. Fo
Eratosthenses was a Greek mathematician who figured out that to find all the prime numbers between two and some large number, you need to remove all the multiples of each number between two and your large number.
"A prime number is a positive integer that has exactly two positive integer factors, 1 and itself.
Fact Monster begins with a short prime number lesson, and a table of all the prime numbers between 1 and 1000.
For middle school and high school students, this Math Forum goes behind simple prime number definition, and introduces both Euclid's theory of prime numbers (which has been proven) and Goldbach's Conjecture (which hasn't.
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