|
To multiply decimal numbers
Line up the two numbers as you would whole numbers.
(The decimals do not need to be lined
up.)
Multiply normally
Count how many digits are to
the right of both decimals
and move your decimal point to the left that many places
in your answer.
|
8.09
x 11.5
4045
8090
80900
93.035
|
0.092
x 0.3
0.0276 |
|
We moved the decimal 3 places
to the left in our answer because there are 3 digits to the right
of the decimal in our factors. |
We moved the decimal 4 places
to the left in our answer because there are 4 digits to the right
of the decimal in our factors. |
Let's Practice!
| Example |
Solution |
49.3
x 0.91
|
49.3
x 0.91
493
44370
44.863 |
| Since
there are 3 digits to the right of the
decimal we move the decimal 3
places to the left in our answer. |
|
603.9
x 0.07 |
6.039
x 0.07
0.42273 |
| Since
there are 5 digits to the right of the
decimal we move the decimal 5
places to the left in our answer. |
|
582
x 1.03
|
582
x 1.03
1746
0000
58200
599.46 |
| Since
there are 2 digits to the right of the
decimal we move the decimal 2
places to the left in our answer. |
Remember:
Multiply decimal numbers normally then count the digits to the right of
the decimals.
This is the number of places you will move the decimal to the left in your answer.
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