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Multiplication and Division Computation Methods

 

Multiplication
Area Model
2-digit by 1-digit     
http://www.youtube.com/watch?v=a0MwnLNln4k (open area model)

4-digit by 1-digit
http://www.khanacademy.org/math/cc-fourth-grade-math/cc-4th-mult-div-topic/cc-4th-area-models/v/4-by-1-multiplication-with-grid (open area model)

2-digit by 2-digit     
http://www.khanacademy.org/math/arithmetic/multiplication-division/area-models-multiplication/v/area-model-for-multiplication (square units/grid)
http://www.showme.com/sh/?h=P8FipAu (open area model)
http://www.youtube.com/watch?v=63DEGVLzS-I (open area model)

Partial Products
2 by 1      http://www.showme.com/sh/?h=9P675hw
3 by 1      http://www.showme.com/sh/?h=Z5QN1Yu
2 by 2      http://www.showme.com/sh/?h=5wjaTDs    *2 by 2 is the last example shown


Division

Repeated Subtraction
http://www.youtube.com/watch?v=cI2Sg64QtWM
http://www.youtube.com/watch?v=rjRxGsBhLj8
http://www.youtube.com/watch?v=Q3a4rcubrMw

Area Model
2-digit by 1-digit
https://www.youtube.com/watch?v=BWG2SnMGuno

3-digit by 1-digit     
https://www.youtube.com/watch?v=RMUsCVVpm4Q
https://www.youtube.com/watch?v=N7boECP9BAE

4-digit by 1-digit
https://www.youtube.com/watch?v=tD39rTrKkoM
https://www.youtube.com/watch?v=DAqwvwE2mLo

Partial Quotients with Friendly Mutliples
http://learnzillion.com/lessons/1482-divide-twodigit-dividends-using-friendly-multiples
http://learnzillion.com/lessons/1483-divide-threedigit-dividends
http://learnzillion.com/lessons/1484-divide-fourdigit-dividends

Partial Quotients
http://www.slideshare.net/guestb30cd4/partial-quotients
http://www.k-5mathteachingresources.com/support-files/division-strategy-partial-quotients1.pdf