Question

below are several lines with units of distance marked on them.
the scale for each line is labeled below the line.
for each line, you are asked to click in a box at a given length on the line. when you click in a box, the value you are asked for will appear.
if you decide that the box you clicked on is not the correct length, click in the box again and the value will disappear. then, click in the box that you think is correct.
click in the box with the blue arrow pointing to 1 centimeter on this line:
(chart 1: a number line with 0, 1/2 in., 1 in., 1 1/2 in., 2 in., 2 1/2 in., 3 in. and boxes with blue arrows)
click in the box with the blue arrow pointing to 1 inch on this line:
(chart 2: a number line with 0, 1 cm, 2 cm, 3 cm, 4 cm, 5 cm and boxes with blue arrows)
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Explanation:

Step1: Convert 1 cm to inches

We use the conversion factor $1\ \text{cm} \approx 0.3937\ \text{in}$, which is closest to $\frac{1}{2}\ \text{in}$ (0.5 in) on the first scale.

Step2: Convert 1 inch to cm

We use the conversion factor $1\ \text{in} \approx 2.54\ \text{cm}$, which is closest to the 2 cm - 3 cm mark, specifically the box above the position between 2 cm and 3 cm (closest to 2.5 cm) on the second scale.

Answer:

1. For the first line (inches scale): Click the box above $\frac{1}{2}\ \text{in.}$
2. For the second line (cm scale): Click the box above the position between 2 cm and 3 cm (the third box from the left)