top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

Write 3-digit number whose 1st digit differs from last by 1. Reverse the digits and subtract smaller from larger one.

0 votes
154 views

Write any three-digit number whose first digit differs from its last by 1. For instance 627 or 506. Reverse the digits then subtract the smaller from the larger number. Do this with several numbers. What do you notice? Does this always happen?

posted Jun 26, 2017 by anonymous

Share this puzzle
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

0 votes

The difference is always 99 whatever is the number.

Example
847 - 748 = 99

answer Aug 15, 2018 by Salil Agrawal



Similar Puzzles
+1 vote

Start with a two-digit number, reverse the digits to make a new number then subtract the smaller from the larger number. Repeat this process until you reach a single digit. Start with other numbers. What do you notice, answer with the explanation why is it happening.

0 votes

What is the number if it divides exactly by 13 and when you write its digits in reverse order you make a square number. (You get a square number when you multiply a number by itself - 64 is square because it is 8 times 8)

0 votes

When a two digit number is multiplied by sum of its digits, the product is 715 but when the reverse of a two digit number is multiplied by sum of its digits the product obtained is 99 less.
What is the sum of the digits of a number?

0 votes

A number consists of 3 digits whose sum is 10.
The middle digit is equal to the difference of the other two and the number will be increased by 99 if its digits are reversed.
What is the square of the number?

+1 vote

The product of two numbers is 39375 and the quotient, when the larger one is divided by the smaller is 7.
What is the sum of the numbers?

...