Page 71 - Science and Technology Std 3

FOR ONLINE USE ONLY
DO NOT DUPLICATE

these measurements do not change even if different weighing
devices are used. Standard units of measuring mass include
FOR ONLINE USE ONLY
quarter a kilogram, half a kilogram and a kilogram. We use
these units in weighing commodities such as flour, meat, sugar
and rice.

Importance of measurements

Read the following passage and then answer the questions
that follow.

One day, Asha went to the shop to buy a kilogram of sugar.
When she reached the shop, she found Angela. She asked her

to measure one kilogram of sugar. Angela took some sugar
and put it in a tin which was equal to one kilogram. Then, she
put it in a paper bag and gave it to Asha. Asha received it and
gave Angela some money. Thereafter, Asha left and went back

home. When she reached home, she gave it to her mother.

Her mother got upset. “Heee! My daughter how much sugar
have you bought?” Asha answered, “I bought a kilogram of
sugar”.

“It does not look like a kilogram,” her mother said. She then
said, “Let us go to the shop.” When they reached to the shop,

they told Angela to weigh it again using a beam balance.
The beam balance indicated the sugar weighed less. Asha’s
mother advised Angela to use a beam balance when weighing
different items.

She told her not to use non-standard measurements, since

they may cause errors. They may either be less or more than
the required amount. When using standard measurements, a
person cannot weigh less or more than the required amount.
Standard measurements give exact mass of various objects.

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PROPERTY OF UNITED REPUBLIC OF TANZANIA GOVERNMENT
Ministry of Education, Science and Technology
Science and Technology 3.indd 64 03/08/2019 11:02