LifeTricks.com 
USER CP
Site Navigation 
UPVOTE
UP
9
DOWN
DOWNVOTE
Mathematics - Multiply by 11 Fast
UPVOTE
9
DOWNVOTE
  • life tricks short link

Multiply by 11 Fast

Mathematics

Leave last and first digits alone, then sum each pair of digits next to each other. For example: 4,281 x 11 becomes (4)(4+2),(2+8)(8+1)(1) or 47,091. When sum of a pair is greater than 10, carry that digit to next left pair (as seen where 2+8 was 10)

Trick Source: Unknown - Source of both the Trick Description and Trick Image are unknown

Is this trick using work of your own without attribution? Click here to PM the user and let them know!


User Comments