| 40457 | A palindrome is a number that reads the same forward and backward… | Medium | |
| 40573 | The difference between the squares of two consecutive odd integers is a… | Medium | |
| 40651 | A palindrome is a number that reads the same forward and backward… | Medium | |
| 40746 | What are the last two digits of 63*35*37*82*71*41 | Medium | |
| 40757 | A little girl is numbering her collection of butterflies by placing single-digit… | Medium | |
| 40792 | N and M are each 3-digit integers | Medium | |
| 40811 | I forgot the last digit of a 7-digit telephone number | Medium | |
| 40941 | A palindrome is a number that reads the same forward and backward… | Medium | |
| 40953 | How many three-digit numbers are there, if the two leftmost digits are… | Medium | |
| 40961 | A printer numbers the pages of a book starting with 1 and… | Medium | |
| 41042 | How many alphabets need to be there in a language if one… | Medium | |
| 41078 | If (10^4 * 3.456789)^10 is written as a single term, how many… | Medium | |
| 41087 | If xyz represents a positive three-digit number, where x, y and z… | Medium | |
| 41117 | What is the 10th digit of (5!*4!*4 | Medium | |
| 41220 | A number of two digits has 3 for its unit’s digit, and… | Medium | |
| 41398 | The decimal d is formed by writing in succession all the positive… | Medium | |
| 41491 | The last digit of the number obtained by multiplying the numbers 41… | Medium | |
| 41504 | The standard model numbers of cell phones in a company are 1… | Medium | |
| 41931 | How many positive integers G less than 10,000 are such that the… | Medium | |
| 42014 | The set X consists of the following terms: {4,44,444,4444,.....}, where the nth… | Medium | |
| 42030 | A palindrome is a number that reads the same forward and backward… | Medium | |
| 42278 | You forgot the three digit code of your safe | Medium | |
| 42343 | In the decimal notation of number (223)3(223)3, what is the third digit… | Medium | |
| 42365 | How many numbers can be made with digits 0, 7, 8 which… | Medium | |
| 42379 | How many odd integers S between 200 and 600 are there such… | Medium | |
| 42419 | The sum of all possible two digit numbers formed from three different… | Medium | |
| 42608 | If the tens digit of positive integers t, y are 6, how… | Medium | |
| 42632 | x, a, z, and b are single digit positive integers | Medium | |
| 42653 | Two digits in father's age are the same as the digit in… | Medium | |
| 42655 | The total number of digit used in numbering the pages of a… | Medium | |
| 42851 | How many times will the digit 4 be written when listing the… | Medium | |
| 42968 | How many even 4-digit integers greater than 8000 are there such that… | Medium | |
| 43199 | How many 6 digits no can be formed using 0,1,2,3,5,7 without repeatation | Medium | |
| 43215 | Employees of a certain company are each to receive a unique 8-digit… | Medium | |
| 43394 | In the simple subtraction problem below, some single digits (not necessarily distinct)… | Medium | |
| 43653 | If a is a positive integer, and if the units digit of… | Medium | |
| 43701 | The difference between a two digit number and the number obtained by… | Medium | |
| 43702 | How many positive numbers not greater than 4300 can be formed using… | Medium | |
| 43777 | How many 4-digit numbers (ABCD) can be formed such that |A –… | Medium | |
| 43817 | s(n) is a n-digit number formed by attaching the first n perfect… | Medium | |
| 43910 | The units digit in the product 274 x 318 x 577 x… | Medium | |
| 43947 | How many 3 digit positive integers with distinct digits are there, which… | Medium | |
| 44003 | S is the infinite sequence S1 = 2, S2 = 22, S3… | Medium | |
| 44108 | Find a 6-digit integer abcdef with the following properties: Take the rightmost… | Medium | |
| 44126 | A palindrome is a number that reads the same forward and backward… | Medium | |
| 44172 | If a number is formed by writing integers 1 to 150 one… | Medium | |
| 44284 | s(n) is a n-digit number formed by attaching the first n perfect… | Medium | |
| 44285 | The digit at the ten’s place of a 2 digit no | Medium | |
| 44288 | Ray writes a two digit number | Medium | |
| 44337 | Each digit in the two-digit number G is halved to form a… | Medium | |