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# Multiplying Decimals Song

Join NUMBEROCK under the sea and learn how to multiply by a decimal number using number sense to determine where the decimal point belongs in the product. Then take a peak above the sea where a pirate ship is battling it’s way through a terrifying lightning storm as we review the traditional method of placing the decimal point when multiplying decimals!

If you like our math joke located on the top right of this page, scroll down and steal it! We made it easy for you. (and, of course, you have our permission)

#### Multiplying Decimals Lyrics:

Let’s use our number sense
to multiply nine and one hundredth
by five and one tenth.
We multiply the one to get one, zero, nine.
In the next place value there’s a five.
X holds the place on the second line;
we get a five, a zero, and a forty-five.
Write a line, a plus sign, tally up the score -
to get one-five-nine-five-four.

Chorus:
by rounding to a simpler number.
Then we can easily see
where the point needs to be.

Now let’s get intense,
and multiply ninety-two hundredths
by three and two tenths.
Multiply the two, get four and eighteen;
in the next place value is a three.
Write an x to hold the place, and then
we get a six and a twenty-seven.
Add it up and get four, four,
a nine and a two, and there’s one step more.

Here’s another way to place the point worth trying:
look at the numbers you are multiplying,
count the number of decimal places.
In the product move left that many spaces. 