| 79876 | One boy forgot the lastdigit of a 7 digit telephone no | Medium | |
| 79915 | What is the units digit of 31 | Medium | |
| 79948 | How many five-digit numbers are there, if the two leftmost digits are… | Medium | |
| 80022 | What is the sum of all 3 digit positive integers that can… | Medium | |
| 80531 | The unit digit in the product (293 * 567 * 917 *… | Medium | |
| 80549 | If the units digit of n^31 is 7, which of the following… | Medium | |
| 80552 | What is the tens digit of 36^5 | Medium | |
| 80590 | What two-digit number is less than the sum of the square of… | Medium | |
| 80664 | How many integers between 10 and 100 are there such that their… | Medium | |
| 80689 | How many times will the digit 6 be written when listing the… | Medium | |
| 81098 | How many integers k greater than 100 and less than 800 are… | Medium | |
| 81189 | What is the 6th digit to the right of the decimal point… | Medium | |
| 81284 | In a three digit number, the hundred digit is 2 more than… | Medium | |
| 81298 | Winners will be announced the following day at 8 AM Pacific/1 PM… | Medium | |
| 81348 | With # andeach representing different digits in the problem below, the difference… | Medium | |
| 81522 | What is the 50th digit to the right of the decimal point… | Medium | |
| 81555 | What are the last two digits of (301*402*503*604*646*547*448*348)^2 | Medium | |
| 81666 | Of the three-digit integers greater than 200, how many have two digits… | Medium | |
| 81768 | Of the three-digit integers greater than 660, how many have two digits… | Medium | |
| 81799 | Each digit 1 through 5 is used exactly once to create a… | Medium | |
| 81811 | How many five-digit numbers are there, if the two leftmost digits are… | Medium | |
| 81842 | The difference between a 6 digit number and the number formed by… | Medium | |
| 81897 | If the tens digit x and the units digit y of a… | Medium | |
| 81953 | If a and b are positive integers and x = 5^a and… | Medium | |
| 82202 | If a two-digit positive integer has its digits reversed, the resulting integer… | Medium | |
| 82343 | If integers ending in zero are excluded, what is the unit digit… | Medium | |
| 82664 | How many integers between 1 and 10^16 are such that the sum… | Medium | |
| 82673 | How many different three-digit multiples of 5 can be composed of digits… | Medium | |
| 82799 | How many integers between 362,855 and 852,755have tens digit 1 and units… | Medium | |
| 82938 | The unit digit in the product (722 * 774 * 889 *… | Medium | |
| 82950 | If a and b are positive integers and x = 4^a and… | Medium | |
| 83087 | A construction company wants to number new houses using digit plates only | Medium | |
| 83094 | What is the unit digit in 12^100 | Medium | |
| 83101 | If 325/999=0.125, what is the 81st digit to the right of the… | Medium | |
| 83223 | What is the sum of all digits for the number 10^29 -… | Medium | |
| 83294 | When 40 is subtracted from a number, it reduces to seven-twelve of… | Medium | |
| 83494 | Meena wrote all the numbers from 1 to 39,999 inclusive | Medium | |
| 83619 | Given that p is a positive even integer with a positive units… | Medium | |
| 84072 | What are the last two digits of 35*37*82*71*41 | Medium | |
| 84288 | How many pages the book have, if total 300 digits are used… | Medium | |
| 84318 | If r = 199,999 and s = 991,999, which of the following… | Medium | |
| 84478 | X Y +Y X ________ The sum of the two digit numbers… | Medium | |
| 84495 | What are the last two digits of 33*76*47*22*58*91 | Medium | |
| 84666 | What is the units digit of (498) (915) (381) (756) (29) | Medium | |
| 84758 | In a two digit number, the digit in the units place is… | Medium | |
| 84842 | In how many no | Medium | |
| 85333 | A telephone company needs to create a set of 3-digit area codes | Medium | |
| 85384 | The unit digit in the product (784x618x917x463) is | Medium | |
| 85674 | How many integers between 334,700 and 458,600 have tens digit 1 and… | Medium | |
| 85774 | There are 27 different three-digit integers that can be formed using only… | Medium | |