| 76706 | Can you find a number such that if we multiply that number… | Medium | |
| 76815 | How many odd 4-digit positive integers Q that are multiples of 5… | Medium | |
| 76824 | What is the tens' digit Q of the sum of the first… | Medium | |
| 77017 | How many natural numbers that are less than 10,000 can be formed… | Medium | |
| 77235 | In how many no | Medium | |
| 77240 | 8k8 + k88 -------- 1,6y6 If k and y represent non-zero digits… | Medium | |
| 77349 | † and ¥ represent nonzero digits, and (†¥)² - (¥†)² is a… | Medium | |
| 77390 | What is the sum of all 3 digit positive integers that can… | Medium | |
| 77443 | If 4,5qD + 8,737 = 13,qD3, where q and D are distinct… | Medium | |
| 77483 | X and Y are positive two-digit integers such that the tens digit… | Medium | |
| 77499 | For a three-digit number xyz, where x, y, and z are the… | Medium | |
| 77597 | A five-character password consists of two letter of the alphabet and three… | Medium | |
| 77679 | 225, or 15^2, is the first perfect square that begins with two… | Medium | |
| 77823 | How many odd four-digit integers greater than 9000 are there such that… | Medium | |
| 77887 | 1,257 1,275 1,527 | Medium | |
| 77902 | AV + CD = AAA, where AV and CD are two-digit numbers… | Medium | |
| 77954 | If s is a positive integer, and if the units' digit of… | Medium | |
| 78125 | What is the last digit of 13^35 | Medium | |
| 78228 | find the last 3 digit of 443^443 | Medium | |
| 78344 | AB + CD = SSS, where AB and CD are two-digit numbers… | Medium | |
| 78394 | A two digit number reversed and multiplied by 4 is 3 more… | Medium | |
| 78638 | If f is a positive integer, and if the units' digit of… | Medium | |
| 78666 | How many integers between 100 and 1000 are there such that their… | Medium | |
| 78670 | If d=1/(2^3*5^10) is expressed as a terminating decimal, how many nonzero digits… | Medium | |
| 78680 | How many positive, 3-digit integers contain at least one 7 | Medium | |
| 78760 | Set X consists of all two-digit primes and set Y consists of… | Medium | |
| 78800 | If 6 different numbers are to be selected from integers 0 to… | Medium | |
| 78813 | The difference between a two-digit number and number obtained by interchanging the… | Medium | |
| 78816 | A security company can use number 1 -7 to create a 5… | Medium | |
| 78903 | The function f is defined for each positive three-digit integer n by… | Medium | |
| 78926 | How many four-digit odd numbers do not use any digit more than… | Medium | |
| 78934 | If a and b are digits, and the number a99,99b/88 = an… | Medium | |
| 79061 | How many three digit numbers contain the digit 5 at least once | Medium | |
| 79256 | If all of the telephone extensions in a certain company must be… | Medium | |
| 79333 | A local bank that has 15 branches uses a two-digit code to… | Medium | |
| 79408 | How many positive integers W less than 10,000 are such that the… | Medium | |
| 79426 | How many digits are required to write numbers between 1 to 100 | Medium | |
| 79430 | Meena wrote number starting from 1 till 19999.Then how many digits did… | Medium | |
| 79564 | The number of positive integers which can be formed by using any… | Medium | |
| 79692 | When positive integer x is divided by positive integer y, the result… | Medium | |
| 79787 | If in a book a total of 3209 digits are used for… | Medium | |
| 79818 | What is the 4 digit no | Medium | |
| 80023 | What is the unit digit in the product (245 x 122 x… | Medium | |
| 80399 | When positive integer x is divided by positive integer y, the result… | Medium | |
| 80476 | The sum of all the digits of the integers from 18 to… | Medium | |
| 80484 | How many digits are in the number 50^8 × 8^3 × 11^3 | Medium | |
| 80753 | What is the two-digit number whose first digit is a and the… | Medium | |
| 80902 | A 2-digit number is such that the product of the digits plus… | Medium | |
| 81019 | A third standard teacher gave a simple multiplication exercise to the kids | Medium | |
| 81079 | The digit sum of the year 2007 is 2 + 0 +… | Medium | |