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Convert Customary Units of Capacity

Key Concepts

  • Identify customary units of measurement for Capacity
  • Use multiplication and division to determine customary measurement equivalencies
  • Use measuring tools and purpose of measuring

What is Capacity? 

Capacity is the total amount of fluid that can be contained in a container, It is the word we use when we measure liquid. 

We use multiplication and division to determine customary measurement equivalencies. 

Vocabulary 

  • Gallon 
  • Quart 
  • Pint 
  • Cup 
  • Fluid Ounce 

Note- Capacity term is use to measure the amount of liquid in the container. 

Some basic Customary Unit of capacity and relation between 

Some basic Customary Unit of capacity and relation between 

Quantity of Customary units of Capacity (Approximate) 

  1. 1 Fluid ounce: – Is equal to the volume of a small medicine cap
  1. 1 Cup: – A small glass holds about 8 fluid ounces
  1. 1 Pint: – A large glass of milk
  1. 1 Quart: – When we want to use many cups of liquid and put them together, we might want to use a quart. 
  1. Gallon: – If we still need more liquid, we can switch to gallon. 
Quantity of Customary units of Capacity (Approximate) 

Conversion between the units of Capacity 

To convert larger unit to a smaller unit, we multiply. 

To convert larger unit to a smaller unit, we multiply. 

Example 1:

Example 1: multiply

Example 2:  

Example 2 multiply
Example 2 multiply

To convert smaller unit to a larger unit, we divide. 

To convert smaller unit to a larger unit, we divide.

Example 1:  

Example 1: divide

Example 2:  

Example 2: divide

Observe the image carefully and try to solve the questions based on conversion between the units of capacity. 

 conversion between the units of capacity. 

1. 14 pints to quart 

Solution: –  

Since, 1 quart = 2 pints 

Therefore, 1 pint = ½ quart 

Now, for 14 pints = ½ ×14

= 7 quarts(qt) 

2. 8 gallons to pint 

Solution: –  

Since, 1 gal = 8 pints 

Therefore, 8 pints = 8 ×

= 64 pints(pt) 

3. 18 ½ quart to cups 

Since, 1 quart = 4 cups 

Therefore, 18 ½ qt = 18 × 4 + ½

= 72 + 2   

= 74 cups 

4. 64 quarts to gallons 

Solution:   

Since, 1 gallon = 4 quarts 

Therefore, 1 quart = ¼ gallon 

Now, for 64 quarts = 64 × ¼   

= 16 gallons (gal) 

5. 13 cups to quarts 

Solution:

Since, 1 quart = 4 cups 

Therefore, 1 cup = ¼ quart 

Now, for 13 cups = 13 × ¼   

= 12-quart 1cup (12qt 1c) 

Real life applications based on units on Capacity (Word Problems) 

1. A tall glass can hold 2 pints and a big mug can holds 34 oz. Which one holds more? 

Solution: – Since 1 pt = 16 oz 

So, 2 pints = 16 × 2 = 32 oz(ounces)  

Therefore, A big mug can hold more.  

2. How many ounces are there in 4 quarts? 

Solution: Since 32 fl. Oz (fluid ounces) = 1 quart (qt) 

So, 4 qt = 32 × 4 = 128 fl. oz 

3. John made some mashed onion. For every two onions he boiled, he added 2 ounces of milk. If he boiled 16 onions, how much milk did he add to the mashed onion?  

Solution: 16 ÷ 2  

= 8 fl oz  

Concept Map

Concept Map

What have we learned

  • Student have learned about the identification of units of capacity.
  • Convert smaller units to large unit
  • Convert larger unit to smaller unit
  • With different model of images students have learnt the real life applications of capacity.

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