Activity:
Classifying mental multiplications
Given
below are some samples of informal methods of multiplication carried
out by children. Some of them are done entirely mentally, others
are partially or fully written. However the steps have been written
down for clarity of the readers.
Look
at the following examples and classify each according to the
method used. Select from the list on the right.
Click on the linked 'comments' to check your answers.
Click
here for explanations of the classifications
>>>
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Classifications
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Front
end multiplication (left to right)
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Multiplication
in stages (using factors)
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Multiplication
by rounding (using distributive property)
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Multiplication
by halving and doubling (moving factors)
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Miscellaneous
methods
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Belinda
![equation4](images/sam04.gif)
Click
here to see comments on Belinda's
method.
Ben
![equation1](images/sam01.gif)
Click
here to see comments on Ben's method.
Craig
![equation8](images/sam08.gif)
Click
here to see comments on Craig's
method.
Greg
![equation5](images/sam05.gif)
Click
here to see comments on Greg's method.
Karim
![equation3](images/sam03.gif)
Click
here to see comments on Karim's
method.
Lara
![equation6](images/sam06.gif)
Click
here to see comments on Lara's method.
Lisa
![equation2](images/sam02.gif)
Click
here to see comments on Lisa's method.
Samantha
![equation7](images/sam07.gif)
Click
here to see comments on Samantha's
method.
Simon
![equation9](images/sam09.gif)
Click
here to see comments on Simon's
method.
Tania
![equation10](images/sam10.gif)
Click
here to see comments on Tania's
method.
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