Search for the different scales or measuring tapes at your home and school. Find out the smallest value that can be measured using each of these scales. Record your observations in a tabular form.
Different measuring instruments have different smallest measurable values.
A 15-cm scale typically has the smallest marking of 1 mm (0.1 cm). A metre scale also has 1 mm as the smallest division.
A measuring tape may have 1 mm or 0.5 cm as the smallest marking depending on its type. A tailor's tape usually has 1 mm markings.
The smallest value that can be measured is called the least count of the instrument.
Explanation
The chapter explains on Page 5 that 1 mm is the smallest value of length that can be measured using a standard scale. The 15-cm scale has markings in cm and mm, with 1 mm being the smallest division. Students should observe various scales and record their least count in a table format.
Solution Steps
Different measuring instruments have different smallest measurable values.
A 15-cm scale typically has the smallest marking of 1 mm (0.1 cm).
A metre scale also has 1 mm as the smallest division.
A measuring tape may have 1 mm or 0.5 cm as the smallest marking depending on its type.
A tailor's tape usually has 1 mm markings.
The smallest value that can be measured is called the least count of the instrument.