Math Riddles

A man was born on January 1st, 23 B.C. and died January 2nd, 23 A.D. How old did he live to be?

Add me to myself and multiply by 4. Divide me by 8 and you will have me once more. What number am I?

An apple is 40 cents, a banana is 60 cents and a grapefruit is 80 cents. How much is a pear?

Can you arrange four nines to make it equal to 100.

Dean Sam and Castiel are three brothers. Interestingly their current age is prime. What’s more interesting that difference between their ages is also prime. How old are they?

Divide 20 by half and add 30, what do you get?

Double my number, I’m less than a score. Half of my number is less than four. Add one to my double when bakers are near. Days of the week are still greater, I fear.

Eggs are $0.12 a dozen. How many eggs can you get for a dollar?

Find the four-digit number in which the first digit is one-fourth of the last digit, the second digit is 6 times the first digit, and the third digit is the second digit plus 3.

Five times the difference of twice a number and three, decreased by the sum of this number and eight, equals thirteen.

Four years ago, Alex was twice as old as Jake. Four years from now, Jake will be 3/4 of Alex’s age. How old is Alex?

How can you add 8 8’s to make 1000?

How can you add eight 8’s to get the number 1000?

How can you get 4 from 5?