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**Video Description:**

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!

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**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:

Let’s think about the reasonableness of our answer

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.