0

84 x 17 = (84)·(17) = (80 + 4)·(10 + 7)
= 8x100 + (   )x10 + 4x10 + 28
= 800 + (   )x10 + 40 + 28 =     1428

0

51

52

53

54

55

56

57

58

59

60

  1 of 50

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