If I show you 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8, you’ll start multiplying those first numbers, and when time runs out, you’ll probably guess that the end result is somewhere around 500. But if I show you 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 and you take the exact same approach, you’ll land at a much higher final estimate — likely around 2,000 — just because the first numbers were the larger ones.