How many 1's are there between 100 to 1000?

• 0k now look into the cart right here where u will find how many ones are between 1 and 1000
  
  0 to 9 = 1 (this indicates the number of 1s)
  
  10 to 19 =1+10 (as all the digits got 1 in them like 11,12,13.....there are 10 digits with 1s in the left and 11 with a 1 in its right just like what we have seen in 0 to 9)
  
  20 to 29 =1
  30 to 39 =1
  .....................
  ....................
  90 to 99 =1
  so except 10 to 19 (got 11 ones) we have got one 1 on 9 other occasions
  so we find
  0 to 99 = 11+(1.9)
  =11 +9
  =20
  
  
  we shall also find 20 ones in the groups ( 200 to 299) ,(300 to 399) ,.,,,,,,,( 900 to 999) as they do not have extra ones in them .see: 91 ,291,391,491,991 .
  so here we got 9 groups that got 20 ones in them
  so except the group ( 100 to 199 ) the number of 1s between 1 and 999 is:
  9.20
  =180
  the group 100 to 199 has got 100 number having an extra 1 each
  so 100 to 199 = 20 +100
  = 120
  so from 1 to 999 we got (180 +120)=300 ones
  1000 got one 1
  so the total is 301
  even a school going child will understand my explanation for sure.:D but if u still cant u can see the chart below
  
  1 to 99 =20
  100 to 199 =120
  200 to 299 =20
  300 to 399 =20
  400 to 499 =20
  500 to 599 =20
  600 to 699 =20
  ...................( my hand is cramping :(
  900 to 999 =20
  1000 = 1
  total=301
• 10 years agoHelpfull: Yes(2) No(0)
• 1001
  on unit digit 1's come 10*10
  on ten digit 1's come 10*10
  on hundred digit 1's come 100
  on thousand digit 1's come 1
  so 100+100+100+1=1001
• 10 years agoHelpfull: Yes(1) No(2)
• from 1-99:20
  from 101-200:99 at 100th place
  total=9*20+99=279
• 11 years agoHelpfull: Yes(0) No(1)
• 100+100+100+1=301
• 10 years agoHelpfull: Yes(0) No(0)