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
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
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
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
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
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