How do i multiply this ? 320.7 million x 72.36 million ? do i have to write out all the zeros?

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Answer 1 · 2018-02-22T17:43:13

No you don't have to write all the zeros we use a technique that is called exponents and index

$320,700,000= 3.207 xx 10^8$

$72,360,000= 7.236 xx 10^7$

now, multiplying the above numbers using power index laws

$(3.207 xx 10^8) xx (7.236 xx 10^7)$

To muliply with the same bases the exponents (powers) are added up like:
$10^8 xx 10^7= 10^(8+7)= 10^15$

and simply multiply the rest using arithmetic
$3.207 xx 7.236 = 23.205852$

Thus, the answer will be
$23.205852 xx 10^15$

Which is written as $2.320582xx10^16$

Answer 2 · 2018-02-22T18:35:52

$23,205.852 " million"$

or

$23.205852 " billion"$

No, you do not need to write all the zeros.

The question was asked with millions in words, so you can just multiply and answer in millions as well.

$320.7$ million $xx 72.36 " million"$

$= (320.7 xx72.36) " million"$

$=23,205.852 " million"$

This can now also be read as:

$23.205852 " billion"$