| There's a bit of a silly trick
to multiplying decimals. It's not really a trick
-- it's just how it works -- but, it's so weird that it
may seem like a trick.
It's going to sound confusing at
first. Just read through it, then look at the
examples, then read it again. It'll be really
easy!
Here's the deal:
|
1) |
Ignore the decimal
points and multiply as usual... |
|
2) |
Count how many
total digits are on the right side of the
decimal points in the guys you are
multiplying... |
|
3) |
Place the decimal
point in your answer so there are this many
digits to the right. |
Let's just do one!
Multiply... Count the
spots behind the decimals... Put the decimal point
in your answer:
Does our answer make sense?
Do a little rounding and think about it...
2.8 is a little less than
3... 3
x
7 =
21... So, our
answer should be a little less than 21. Yep, our
answer looks good!
And remember, you can always
grab a calculator to check your answers on these!
Here's another one:
Before we get into it, what
should our answer be close to? Do some rounding...
3 x
6 =
18... So, our answer should be around
18!
Here we go!
Multiply... Count the
spots behind the decimals... Put the decimal point
in your answer:
Let's do one more...
Multiply... Count the
spots behind the decimals... Put the decimal point
in your answer:
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