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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.
• No dollar coins or half dollars?
• These coins are very rarely used in the US today. While these are still valid currency, they are not distributed in the quantity the other denominations are.
• Can you also do Indian coin's also?
• 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?
(1 vote)
• Hi bladedrinks !
At first, nickels and dimes were made of silver. In fact the nickel was not called a nickel back then, it was called a "half disme" (pronounced "half dime") because it was half the value of the dime and made of the same material. However, this meant that the half dime (now known as a nickel) was only half the size of the already small dime! People responded to the size of the half dime, saying that it was much too small to handle nicely, so the government changed the coin so that it was made out of nickel, which was a less valuable material. Because the half dime was now made out of nickel instead of silver, (nickel was less valuable than silver) the half dime ended up being bigger than the dime. Since the half dime was being made out of nickel, people started calling the five-cent coin a "nickel," which is how we refer to it today. Nickels are now made up of less valuable materials, but the size has remained the same because of tradition. Hope I helped.