0

87 x 32 = (87)·(32) = (80 + 7)·(30 + 2)
= (   )x100 + 16x10 + 21x10 + 14
= (   )x100 + 160 + 210 + 14 =     2784

0

21

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  1 of 30

FirstOuterInnerLast

 

Level

1

2

3

4

How Many

5

10

20

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