We are nearing the end of our multiplication unit. We will still have another week or so of practice and extending what we do know into bigger numbers, but we have covered a good bit of the unit. We will be having our multiplication test early during that last week of school before the holidays. I thought I would go ahead and send this out though so if the children wanted to be playing some of these games for practice, they could.
Terms:
Product – answer to a multiplication problem
Array – rectangular configuration of items
Factor – a number used in a multiplication problem
Example:
The factors of 12 are: 1, 12, 2, 6, 3, 4
Multiple – a number that you say if counting by another
number or the answer to a multiplication problem involving a specific number
Example:
Some factors of 4 are: 4, 16, 24, 28, 40, 44, 400
Great game for practicing multiples: http://www.sheppardsoftware.com/mathgames/multiple/multiple_frenzy.htm
App for multiples and factors:
Math Slicer
FactorPop!
Prime Number – a number that only has the factors of 1 and
itself
Example: 3,
5, 7, 11, 13
Composite Number – a number that has more than two factors
Example: 4,
9, 21, 24
App for prime and composite numbers: FactorSamurai
Types of Problems:
Multiply 3 factors
Example: 25
x 3 x 5
Multiply by multiples of tens
Example:
400 x 30
Multiply two-digit by two-digit numbers
Example: 95
x 34
Multiply larger numbers
Example:
4,567 x 21
Multiply money
Example:
$53.27 x 19
Solve multiplication problems in several ways
Example:
Solve 22 x 5
20 x 5 = 100; 2 x 5 = 10; 100 + 10 = 110
Double/Half: 11 x 10 = 110
Column Multiplication/Algorithm
In all honesty, for most of these, the children can make up their own problems, or they could roll a dice to create numbers. Just practicing is the best thing.
Here is an online game though: http://www.mathplayground.com/multiplication05.html
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