1

44 x 21 = (44)·(21) = (40 + 4)·(20 + 1)
= 8x100 + (   )x10 + 8x10 + 4
= 800 + (   )x10 + 80 + 4 =     924

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  2 of 50

FirstOuterInnerLast

 

Level

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2

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How Many

5

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30

50

 

FOIL method @

 

Example >>>

 34 x 52 =  (30 + 4)·(50 + 2)

 

 

 

 

First

(A + B)·(C + D) = AC + AD + BC + BD

= 30 x 50

= 1500

Outer

(A + B)·(C + D) = AC + AD + BC + BD

= 30 x 2

=     60

Inner

(A + B)·(C + D) = AC + AD + BC + BD

= 4 x 50

=   200

Last

(A + B)·(C + D) = AC + AD + BC + BD

= 4 x 2

=       8

 

 

   

 

 

 

= 1768