Question #9 You are looking for an even two-digit number. The sum of its two digits is a prime number. It has six divisors. The sum of its divisors is 28. It is less than 22. What's the number? Email you answer to terraferma@whsad.org with your name and question #9 in the subject. … [Read more...]

## Daily Extra Credit: 10/8

Questions #8 You are looking for a two digit number that is greater than 30. The number is divisible by 11 Half the number is a two-digit number with the same numerals for both the first and second digits. Twice the number is a two-digit number with the same numerals for both the first and second digits. What's the number? Email your response to terraferma@whsad.org with your name and question #8 in the subject line. … [Read more...]

## Daily Extra Credit: 10/7

Question #7 You are looking for a two digit number The second digit is twice the first digit. The number has 9 divisors. Twice the number is a two digit number. The number plus 1 is a prime number. What is the number? Email the number to terraferma@whsad.org and include Your Name and Question #7 in the subject line. … [Read more...]