Koleka Furlett can’t even count the number of times she’s tested her math trick on a chalkboard with numbers ranging in the millions and billions. It’s a trick she came up with in the third grade when she was first learning her multiplication tables. Koleka noticed a pattern when multiplying numbers by five that made for a handy shortcut. Basically, whatever number you want to multiply by 5, divide it in half and stick a 0 on the end. (For example, 16 x 5. Half of 16 is 8, then stick a 0 on the