FOIL

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31 x 73 = (31)·(73) = (20 + 11)·(70 + 3)
= 14x100 + 6x10 + 77x10 + ( )
= 1400 + 60 + 770 + ( ) = 2263

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FirstOuterInnerLast

Level

How Many

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