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Sometimes in
order to solve word problems, it is necessary to multiply by large
numbers. |
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Three-digit
multiplication involves several steps (and lots of space)! |
324
x256
|
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Step one:
Multiply by ones digit to get the first
partial product. |
| Step two:
Multiply by tens digit to get the
second partial product. |
| Step three:
Multiply by hundreds digit to get the
third partial product. |
| Step four:
Add all partial products together to get the final product! |
| Remember when you
multiply by the tens' digit (5 in this case)
you are really multiplying by 50. When you multiply by the
hundreds' digit (2 in this case), you
are really multiplying by 200. YOU NEED TO ANNEX ZEROS IN YOUR
PARTIAL PRODUCTS IF YOU CANNOT REMEMBER TO LEAVE SPACES FOR THEM!!! |
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Let's look at some
sample problems that would need three-digit multiplication!
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There were 346
tickets sold for a concert. If each ticket cost $9.95, what
was the total money spent?
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346
x 9.95 |
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An airplane travels 545
miles per hour. If the plane flies for 22.5 hours, how
far does it travel?
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545
x 22.5 |
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A Pizza Shop uses 127
cups of pizza sauce per day. How many cups will they use in a
year?
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127
x
365 |
Let's Practice
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