An array is made when items are arranged in rows and columns. This array has 12 counters. Every row in an array is the same length and every column in an array is the same length. This array has 4 ...

Two times two is four. Ten times 10 equals 100. Twelve times 12 equals 144. Every adult can remember learning and reciting his multiplication tables.

Computer scientists are a demanding bunch. For them, it’s not enough to get the right answer to a problem — the goal, almost always, is to get the answer as efficiently as possible. Take the act of ...