We will discuss about addition and subtraction of measuring capacity. The standard unit of measuring capacity is liter and the
smaller unit is milliliter. The short way is to write liter as l and milliliter
as ml. The liquid medicines are measured in ml. There are many types of vessels
having capacity of 1 liter, 500 milliliter, 250 milliliter, etc,.
Containers or vessels meant to store different things like milk, sauce, mustard oil, etc., have different capacities. Therefore, the quantity of liquid a vessel can hold is its capacity.
Relationship between liter (l) and milliliter (ml):
We know one of the 1000 parts of a liter (l) is called a milliliter (ml).
So, 1 liter = 1000 milliliter
or, 1 l = 1000 ml
and, 1000 ml = 1 l
Addition and subtraction of measuring capacity in liters and milliliters:
1. (i) Add 525 ml and 275 ml
Solution:
525 ml
+ 275 ml
800 ml
(ii) Subtract 275 from 685 ml
Solution:
685 ml
 275 ml
410 ml
2. A can holds 15 l and 500 ml of milk. Out of it 8 l and 350 ml milk is consumed. How much milk is left in the can now?
Solution:
Quantity of milk in the can = 15 l 500 ml
Quantity of milk consumed = 8 l 350 ml
Quantity of milk left = 15 l 500 ml  8 l 350 ml
Thus, 15 l 500 ml 500 ml – 350 ml = 150 ml
 8 l 350 ml 15 l – 8 l = 7 l
7 l 150 ml
Therefore, quantity of milk left = 7 l 150 ml
3. How much milk should be added to 12 l of milk to make it 16 l milk?
Solution:
Total milk should be = 16 l
Milk at present =  12 l
Therefore, milk required = 4 l
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