Quick multiplication
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Transcript of Quick multiplication
Methods of Multiplication
Two digits number multiplicationA B
X a b___________________________
? ? ? ? ?___________________________
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Step I Step II Step III
Multiply unit digits
A B
X a b
____________________
bB
____________________
Cross Multiply + Carry
A B
X a b
_________________________
bA+aB bB
_________________________
Multiply ten’s digits+ Carry
A B
X a b_________________________aA bA+aB bB_________________________
Step I Step II Step III
7 9
X 4 8
____________________
7 2
____________________
7 9
X 4 8
_________________________
56+36+7
9 9 2
_________________________
7 9
X 4 8_________________________28+93 7 9 2_________________________
Answer : 3792
Multiplication
Three digits number multiplication
A B C
X a b c
__________________________________
? ? ? ? ? ?
__________________________________
Methods of MultiplicationStep I
A B C
a b c_____________________________________________
cCStep II
A B C
a b c_____________________________________________
cB+bC cC Step VA B C
a b c______________________________________________________aA bA+aB cA+bB+aCcB+bC cC
Step IIIA B C
a b c_____________________________________________________
cA+bB+aCcB+bC cC
Step IVA B C
a b c__________________________________________________________ bA+aB cA+bB+aC
cB+bC cC
ExampleStep I
3 5 2
8 4 9_____________________________________________
1 8Step II
3 5 2
8 4 9_____________________________________________
45+8+15 4 8
Step V 3 5 2
8 4 9______________________________________________________24+52 9 8 8 4 8Step III
3 5 2
8 4 9 _____________________________________________________
27+20+16+56 8 4 8
Step IV 3 5 2
8 4 9__________________________________________________________12+40+6
5 8 8 4 8
Answer : 298848
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http://facebook.com/EduEvoke
http://eduevoke.blogspot.in
(Copy the link and paste into your browser. Or, when in a slide show, click the photo.)
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