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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