For example, 1:3= one-third, which is the previous number divided by the later number.

Mutual conversion between digital scale and line scale

I can't draw line segments. It's just a hint. It's a one-centimeter-long line segment marked with numbers.

You only need to measure the distance of a section and compare it with the data after 0 (the unit of the latter data is the same as that of the measured tool, which needs to be converted appropriately).