「1兆」は英語で何と言う？

$1,000,000,000,000

How do you say this number in English? Most students have trouble reading big numbers in class. One major reason is because numbers are read/written very differently in Japanese.

For example,
一千円 (1,000) is one thousand yen. (No problem)
九千九百九十九円　(9,999) is nine thousand nine hundred ninety-nine yen. (No problem there either)

however 一万円　 (10,000) is... ten thousand. (Here is where things get tricky)
十万円　(100,000) is one hundred thousand.
百万円　(1,000,000) is one million.
一千万円　(10,000,000) is ten million.
Japanese numbers move in four digits but many Western languages move in three.
So what can you do?
Simple, just look for the first comma on the left. That will tell you how to read the number.
1,000 (ONE thousand)Secondly, how many digits are there after the first comma.
1,000 (there are three digits after the first comma so it is thousand)

If there are 6 digits after the first comma, it is million (1,000,000)
If there are 9 digits after the first comma, it is billion (1,000,000,000)
If there are 12 digits after the first comma, it is trillion (1,000,000,000,000)
If there are 15 digits after the first comma, (you most likely will not need to know this number unless you are a hardcore scrabble player.)


Do you know how to read the numbers below? 
The earth's population recently reached 7,000,000,000. 
The population in Japan is  around 125,000,000.
The U.S. public debt is $14,993,980,920,226. 
The price tag of my dream car, a Mercedes AMG SLS is at least $185,750.
The average household income in Japan (in 2009) was ¥5,475,000.