1+2+3+4+5+6+9879+78=?

• 1+2+3+4+5+6+9878+78=9978
• 11 years agoHelpfull: Yes(4) No(3)
• add 1+2+3+4+5+6=21
  now add 21 to 9879
  i.e. 9900 now you can easily add 78 in it
  so answer is 9978
• 11 years agoHelpfull: Yes(2) No(1)
• 1+2+3+4+5=21
  then 21+9879=9900
  9900+78=9978
  ans:9978
• 11 years agoHelpfull: Yes(1) No(1)
• i know
  use any calculator
  
• 11 years agoHelpfull: Yes(0) No(0)