GRE Math Review Questions

Answer: D - 160 shares.

To divide by six mentally, first divide by two (i.e., halve the number), then divide the resulting number by three. In this case, 960 divided by two is 480, and 480 divided by 3 is 160.

Key Takeaway: To divide large numbers, often you can do it mentally in steps, rather than all at once. All that is required is to segment the divisor into its component parts. In the previous example, the divisor of 6 is segmented into 2 and 3, and the division is carried out.