0

8371 x 2551 = (8371)·(2551) = (7850 + 521)·(2010 + 541)
= 157785x100 + 424685x10 + 104721x10 + (    )
= 1.57785E+07 + 4246850 + 1047210 + (    ) =     2.135442E+07

1

201

202

203

204

205

206

207

208

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210

  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