The graduations of which scale is derived from the primary scale?

What is not essential information to construct a scale from the following?

Which scale you prefer if there is a need to measure most accurately.

Which scale represents only two units or a unit and its sub-division?

Given, below are the steps related to constructing a scale of 1:50 to show meters and decimeters and the maximum length is 5 meters. Arrange the steps i. Then divide the 1st part into 10 equal divisions ii. Determining the length of scale 1/50 x 500 cm = 10 cm iii. Determining R.F. here it is 1/50 iv. Draw a line 10 cm long and divide it into 5 equal parts

How many divisions a line has to be made if it is given to prepare plain scale up to 7 yards?

In preparing a plain scale of feet and yards, the first division is to be divided into how many sub-divisions?

In preparing a plain scale of feet and inches, how many sub-divisions do the first division is to be divided?

A plain scale is made to show 7 yards and subdivision is feet. To measure 2 feet, how many divisions it is to take on the left side of origin?

Which scale is employed when we need to measure in three units?