This question is an interesting Number Properties Problem Solving GMAT prep question . How many digits does the product of 412 and 523 contain? A. 12 B. 13 C. 23 D. 24 E. 35 The correct answer is choice D. We can rewrite the given numbers as 224 * 523. i.e., 2 * 223 * 523 = 2 * 1023. This is a 24 digit number. … [Read more...] about GMAT Problem Solving : Number Properties