On multiplying a number by 7, the product is a number each of whose digits is 3. The smallest such number is:

• 47619
  
  Last digit should be 9.
  when multiplying 7 with 9 , we get 63.
  place 3 at unit place , we get 6 as carry.
  Next digit of number should be such that we get product with 7 as a number whose last digit is 13-6=7.
  such number is 1.
  when 7 is multiplied with 1 , we get 7.
  add carry 6 to it and we get 13.
  so 3 will get at tens place and 1 carry for next place.
  so next digit should give last digit as 2 (3-1=2).
  such digit is 6.
  ...
  ..
  so continuing like this , we get desired number as 47619.
• 12 years agoHelpfull: Yes(4) No(1)
• Answer is:47619
  47619*7=333333
• 12 years agoHelpfull: Yes(2) No(3)