• Note down the units to be measured i.e. km, m, cm——
• Find the R.F. of the scale.
• Find the length, L, of the scale

 L= (R.F.) x actual distance to be measured

Draw a line and mark 0, 1, 2, 3, 4—— at equal distances on the right side of zero.

Sub-DIVIDE 1 main part into 10 parts on the left side of zero.

Mention CLEARLY the units and sub units below the scale constructed.

 Example: Construct a scale having 2cm = 1 m to show m and dm and it should be long enough to measure a distance of 10 m.

Units are m and dm.

F. = 2/100=1/50

L = (1/50) x 10 x 100=20 cm

Draw a line of 20 cm length. Divide it into 10 equal parts to represent 1 m each.

Mark zero after the FIRST division and then number it 1, 2, 3, ——up to 9 on the right side of zero.

Divide the first part into ten equal divisions to represent 1 decimetre each.

Mark ten points on the left side of zero.

Represent full meters on the right side and centimeters on the left side of zero to represent any required length say 5m 7 dm.

 L= (R.F.) x actual distance to be measured

Draw a line and mark 0, 1, 2, 3, 4—— at equal distances on the right side of zero.

Sub-divide 1 main part into 10 parts on the left side of zero.

Mention clearly the units and sub units below the scale constructed.

 Example: Construct a scale having 2cm = 1 m to show m and dm and it should be long enough to measure a distance of 10 m.

Units are m and dm.

F. = 2/100=1/50

L = (1/50) x 10 x 100=20 cm

Draw a line of 20 cm length. Divide it into 10 equal parts to represent 1 m each.

Mark zero after the first division and then number it 1, 2, 3, ——up to 9 on the right side of zero.

Divide the first part into ten equal divisions to represent 1 decimetre each.

Mark ten points on the left side of zero.

Represent full meters on the right side and centimeters on the left side of zero to represent any required length say 5m 7 dm.