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9. Ramu got an empty 250 ml coconut oil bottle. Look at the picture and discuss what he
did to make his measuring bottle.
Ans. To make a measuring bottle: Take two empty bottles – one of large size and another of
250 ml. Fill the 250 ml bottle with water and pour the entire water into the large bottle and
mark the level of 250 ml. Repeat the process again and now mark the level as 500 ml. On next
repetition, the level should be marked as 750 ml. Again repeat the process and mark the level
as 1 litre. Thus, we got a measuring bottle clearly marked 250 ml, 500 ml, 750 ml and 1 litre.
10. Find you own way to make a bottle which can measure 200 ml, 400 ml, 600 ml, 800 ml
and 1 litre. Discuss with your friends and teacher how you made this.
Ans. To make a measuring bottle: Take two empty bottle – one of a large size and another
of 200 ml. Fill the 200 ml bottle with water and pour the entire water into the large bottle and
mark the level as 200 ml. Repeat the process again and now mark the level as 400 ml. Follow
the same process and mark the levels as 600 ml, 800 ml and 1 litre respectively. Thus, I have
obtained my measuring bottle.
11. Look at the buckets, mugs, glasses and other things in you house. Guess how much
water each can hold. Check if your guess is right by using your measuring bottle.
Ans.
Guess My Measure
Mug 1 300 ml 250 ml
Mug 2 500 ml 500 ml
12. Neetu has to take 3 injections in a day for 5 days. How much medicine will she need
in one day? How much medicine in all for 5 days?
15. Amina’s water bottle holds one litre of water. She drank 250 ml of water and her
friend Govind drank 150 ml. How much water is left in her bottle?
16. Yousuf runs a tea shop. For making a glass of tea he uses 20 ml of milk. Yesterday he
made 100 glasses of tea. How much milk did he use?
17. Radha’s grandma was ill. The doctor gave her a bottle with 200 ml. of medicine. She
has to take the medicine every morning for 10 days. How many millimetres of medicine
does she have to take every morning?
19. How many litres of water does your family use in a day? Guess and fill this table.
Ans.
(a) Is there any tap in your school or your home which is leaking?
(b) How much water do you think we waste through a leaking tap?
Ans. (b) About 12 litres of water is wasted through a leaking tap in a day.
(c) Place your litre jar below the leaking tap so as to catch all the drops in the bottle.
After one hour check how much water is in the bottle. Find out how much water is
wasted in a day?
Ans. The man first measured 5 litres and then took out 3 litres such that (5 – 3) = 2 litres of
milk was given to Geetha and Ammini. The same process was repeated to get another 2 litres
of milk. In this way he was able to give them exactly 4 litres of milk.