Need for Standard Measurement | 3rd Maths: Term 1 Unit 4

3rd Maths: Term 1 Unit 4: Measurements

Chapter 4: Measurements

Need for standard Measurement

Teacher’s note: Teacher can facilitate the children to understand the need for standard measurements.

Activity 1

Ragu measured the length of his class table using the non−standard measurements and tabulated them as follows. complete the following table by measuring the length of your class table along with your friends by measuring the length of your class table.

Table for measuring class table length with hand span, cubit, and foot span.

Activity 2

Measure the length of a ribbon by your hand span.

Illustration of measuring with a hand span.

Friend 1 −______________ hands pan

Friend 2 −______________ hands pan

Friend 3 −______________ hands pan

Friend 4 −______________ hands pan

Measurements made using non standard units differ from person to person.

Can you guess the reason for their different answers?

Activity 3

Form a group of 5 members and measure the length of the blackboard in you classroom using the following tools and tabulate it.

Notebook and a ruler

Table for measuring blackboard length with a notebook and ruler.

Observe the measurements and discuss

Did you note that all the measurements made by Kala and her friends are same?

MEASUREMENT OF LENGTH

Measuring the length of objects around us using simple tools.

Comparison of Non-Standard and Standard Units of Measurement.

NON − STANDARD UNITS

(i) Finger width

(ii) Hand span

(iii) Cubit

(iv) Pace

(v) Foot span.

( Measurement varies from person to person )

STANDARD UNITS

(i) Millimeter

(ii) Centimeter

(iii) Meter

(iv) Kilometer

( Measurement remains the same. )