Quick MultiplicationLet’s Get Started…

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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