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 hundred-thousands,the ten-thousands,and the thousands respectively.
Again, the position occupied by 2 is the hundred-thousands and putting a 2 in this position means that there are 2 hundred-thousands or two hundred
In the same way, putting a 4 in the ten-thousands position means that there are 4 ten-thousands or forty
thousand because 4 tens is forty.
Finally, putting a 6 in the thousands position means that there are 6 thousands or six
Putting it all together, we have
) thousand +
) thousand + (six
) thousand =
(two hundred forty six
)thousand = 246
What gives us the right to just add two hundred
, 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
) thousand + (forty
) thousand + (six
) thousand as
( two hundred forty six
) thousand = 246
By the same token, the next group name, which is 'millions' is read
five hundred twenty
million = 520
The whole number can be read as:
(two hundred thirty four
) billion (five hundred twenty
) million (two hundred forty six
) thousand nine hundred seventy-eight
Notice the hyphen between seventy and eight. Similarly, 45 is written as forty-five with a hyphen between forty and five.
) billion (520
) million (246
355,645 is read three hundred fifty five thousand, six hundred forty-five
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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