On a ruler, 1.6 inches would be slightly more than 1.5 inches, but less than 1.75 inches.
To break it down:
1 inch is the full length from the starting point (0) to the 1-inch mark.
0.5 inch is halfway between 1 and 2 inches.
0.6 inch is a little more than halfway between 1.5 inches and 2 inches.
So, 1.6 inches would be just a bit past the 1.5-inch mark, closer to the 1.75-inch mark on a standard ruler. You could estimate its position between the lines for 1.5 and 1.75 inches.
