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  Math Shortcuts  

                                                                          

Multiplication by 11

Examples

Multiply 43 by 11

Think it as 043 x 11

Bring down the ones digit

          ---- ---- 3

Add 4 and 3  ( 7 )

          ---- 7 3

Add 0 and 4 ( 4)

         473   (answer)

 

 

Multiply 78 by 11

Think it as 078 x 11

Bring down the ones digit

          ---- ---- 8

Add 7 and 8  ( 15)

          ---- 5 8

carry 1

Add 0 and 7  plus the 1 you carred (8).

         858   (answer)

 
Multiply 284  by 11

Think it as 0284 x 11

Bring down the ones digit

          ---- ---- 4

Add 8 and 4  ( 12)

          ---- 2 4

carry 1

Add 2 and 8  plus the 1 you carried (1)   (11).

        --- 124  

carry 1

Add 2 and 0  plus the 1 you carried (1)   (3).

            3124  (answer)

 

 

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