When writing a four-digit number, such as Four thousand five hundred, it is permissible to omit the comma and write 4500. We may write "Five" as 5 rather than 005.
The exception is the class on the extreme left. Therefore writeĪgain, we must write "sixteen thousand" as 016 and "nine" as 009 because each class must have three digits. After the billions, we expect the millions, but it is absent. (except perhaps the first class on the left) has exactly three digits:Īnswer. (For example, we should write $609.50 as "Six hundred nine dollars and fifty cents." Not "Six hundred and nine dollars.") When a class is absent, we do not say its name we do not say, "SevenĪlso, every class has three digits and so we must distinguish theĪs for "and," in speech it is common to say "Six hundred and nine," but in writing we should reserve "and" for the decimal point, as we will see in the next Lesson. Starting from the right, place commas every three digits: The left, 256, read each three-digit group. Starting from the left, read each three-digit group then say the name of its class. How do we read a whole number, however large?
Together with knowing the sequence of class names, that is all that is necessary to be able to name or read any whole number.
#THE POWER OF TEN HOW TO#
In Lesson 1 we showed how to read and write any number from 1 to 999, which are the numbers in the class of Ones. Note that each class is 1000 times the previous class the Thousands are 1000 times the Ones the Millions are 1000 times the Thousands and so on. To read a number more easily, we separate each class - each group of three digits - by commas. Starting with Billions ( bi for two), each class has a Latin Notice how the names fall into groups of three:
The second power of 10 is 100 it has two 0's. (The metric system is the system of measurement based on the powers of 10 see Lesson 4.) 10 Thousands.Įach power is composed of ten of the one above. They are the numbers produced when, starting with One, we continue collecting them into groups of 10.ġ0 Ones. The numbers in that sequence are called the powers of 10. Ten One Thousands are called Ten Thousand. The number we call One Thousand is a collection of ten One Hundreds. A number is the actual collection of units. We saw in Lesson 1 that '364' is a numeral, which is a symbol for a number. Those ten marks are also known as the Arabic numerals, because it was the Arab mathematicians who introduced them into Europe from India, where their forms evolved.
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