Page 65 - Science and Technology Std 3

FOR ONLINE USE ONLY
DO NOT DUPLICATE

Figure 1 shows a girl measuring the length of a table using a
ruler. Beside her is a boy waiting to measure the length of the
same table.
FOR ONLINE USE ONLY

Activity 1 Measuring length

Materials A 30 centimetre ruler and a table

Procedure

(i) Mark the starting point on a table.

(ii) Measure 150cm using a ruler.
(iii) Mark the end point.

(iv) Ask your friend to take the measurement again using
a ruler from the same starting point and end points.
Have you ended at the same point? Explain the reason
for your answer.

When you measure the length of the table using the ruler, you

will get the same results. A ruler is a device that uses standard
measurements. A standard measurement is that which gives
the same correct results. The standard units of measurements

for length include millimetre (mm), centimetre (cm) and metre
(m). Another device that is used to measure length is a tape
measure. This device is used to measure lengths of different

objects in our environment.

Non-standard measurements
This type of measurement depends on the agreement made

by users in a given place. Therefore, they differ from one
community to another.

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PROPERTY OF UNITED REPUBLIC OF TANZANIA GOVERNMENT
Ministry of Education, Science and Technology
Science and Technology 3.indd 58 03/08/2019 11:02