How many keystrokes are needed to type
numbers from 1 to 1000?

• 1 to 9.............9 = 9
  10 to 99...........90*2 = 180
  100 to 999.........900*3=2700
  1000...............4 = 4
  +
  ------------------------------
  2893
• 12 years agoHelpfull: Yes(45) No(0)
• 1-9 no. of keystrokes=9
  10-99 no. of keystrokes=90*2=180
  100-999 no. of keystrokes=((999-100)+1)*3=2700
  1000 no. of keystrokes=4
  total =9+180+2700+4=2893
• 12 years agoHelpfull: Yes(6) No(0)
• 2893 key strokes are needed to type nos from 1 to 1000
  numbers 1 to 9 require 1*9=9 key strokes
  numbers 10 to 99 require 2*90=180 key strokes
  numbers 100 to 999 require 3*900=2700 key strokes
  number 1000 needs 4 key strokes
  so adding them all 9+180+2700+4=2893 strokes
• 12 years agoHelpfull: Yes(4) No(0)
• ans=2788
  1-9=9
  10-99=178
  100-999=2597
  1000=4
  add all
• 12 years agoHelpfull: Yes(2) No(12)
• 1 to 9.............9 = 9
  10 to 99...........90*2 = 180
  100 to 999.........900*3=2700
  1000...............4 = 4
  
  addng we get 2893
• 12 years agoHelpfull: Yes(2) No(0)