Reading and writing whole numbers
Reading and writing whole numbers can be explained by using the following illustration. Take a close look and carefully study it!
Recall that the
place value for 2, 4, and 6 are the hundredthousands,the tenthousands,and the thousands respectively.
Again, the position occupied by 2 is the hundredthousands and putting a 2 in this position means that there are 2 hundredthousands or
two hundred thousand.
In the same way, putting a 4 in the tenthousands position means that there are 4 tenthousands or
forty thousand because 4 tens is forty.
Finally, putting a 6 in the thousands position means that there are 6 thousands or
six thousand.
Putting it all together, we have
(
two hundred) thousand +
(
forty) thousand + (
six) thousand =
(
two hundred +
forty +
six)thousand =
(
two hundred forty six)thousand =
246 thousand
What gives us the right to just add
two hundred,
forty, and
six?
Try to do the following:
two hundred cars + forty cars + six cars.
Would not you agree that it is equal to two hundred forty six cars?
The above is the same, except that instead of using cars, we are using thousand.
The group name, as shown in the illustration, is 'thousand'
In general, it is unnecessary to say it three times.
When reading whole numbers, always read the numeral first, which is
246 and then the group name from left to right.
Therefore, we read
(
two hundred) thousand + (
forty) thousand + (
six) thousand as
(
two hundred forty six) thousand =
246 thousand.
By the same token, the next group name, which is 'millions' is read
five hundred twenty million =
520 million
The whole number can be read as:
(
two hundred thirty four) billion (
five hundred twenty) million (
two hundred forty six) thousand nine hundred seventyeight
Notice the hyphen between seventy and eight. Similarly, 45 is written as fortyfive with a hyphen between forty and five.
(
234) billion (
520) million (
246)thousand 978
Other examples
355,645 is read three hundred fifty five thousand, six hundred fortyfive
16,006,006 is read sixteen millions, six thousand, six
25,000,000,000 is read twenty five billion
knowing place value and reading and writing whole numbers are important to understand the lessons that will follow. Study them well; It will pay off!
Reading and writing whole numbers quiz. Test your knowledge.

Jul 03, 20 09:51 AM
factoring trinomials (ax^2 + bx + c ) when a is equal to 1 is the goal of this lesson.
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