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Lesson 9: Money

# Counting American coins

Sal adds to find ​the total value when given an amount US coins.

## Want to join the conversation?

• Why every student of Khan Academy have to learn US currency? What about other country's currency?
(1 vote)
You don't have to learn about US currency unless you have a teacher who assigned the lesson.

Khan Academy started in the US, but the focus is on improving education worldwide. Currently, they're focusing on k-12 in India and the US, because those countries have school systems that are using KA the most. As more schools and countries use KA, they will likely expand the currency lessons.
• What is this?! These coins don't even have numbers on them. The sizes are weird. And some (like the "dime") don't even say the value with words.
• I know all of the coins look different just get used to them:
A penny is the only brown coin, and it is worth 1 cent.
A nickel is a medium-sized silver coin and is worth 5 cents.
A dime is the smallest silver coin and is worth 10 cents.
A quarter is a large silver coin and is worth 25 cents.
A half-dollar is the largest silver coin and is worth 50 cents.
• Why did the government start producing plastic bills instead of continuing to produce paper bills?
• Plastic money are harder to counterfeit than paper. Plastic money lasts 3-5 times longer than paper. Paper money shreds tiny bits and dust; causing problems for optical read sensors in ATMs/Vending machines. Plastic money will survive being washed in the laundry :)
• I am very disappointed to tell you that I do not understand American currency and finds it hard to add or take away currency of America as I live in England so can you put up questions on other currency as well?
• In American currency, 1 dollar (\$1) is 100 cents. This means that 1 cent (1c) is 1/100 of a dollar.
Dollar bills (paper money) commonly have values \$1, \$5, \$10, \$20, \$50, and \$100. There are \$2 bills, but they are rare.
The four common types of coins are pennies, nickels, dimes, and quarters. Less common types of coins are 50-cent pieces and dollar coins.
A penny is 1 cent.
A nickel is 5 cents.
A dime is 10 cents.
A quarter is 25 cents.

Have a blessed, wonderful day!
• How did money get its name?
• The word "money" is believed to originate from a temple of Juno, on Capitoline, one of Rome's seven hills. In the ancient world, Juno was often associated with money. The temple of Juno Moneta at Rome was the place where the mint of Ancient Rome was located.
• what was the first coin made
• THe first US-minted coin was the half-disme (pronounced deem), that was minted in 1792. Prior to this, there were many differing types of state currencies and the continental currency used in the revolutionary period, but as those began to become too confusing or devalue horrendously, the gvernment adopted the dollar system.
• why is been franklin on a 100 dollar bill if he's not a president all others are presidents
• A nickle represents 5 cents and a dime 10 cents. Why is the area of a nickle coin bigger than that of a dime? It's too ridiculous, isn't it?