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Convert Customary Units of Weight

Grade 5
Sep 20, 2022

What is Weight?  

Weight is the measure of how heavy an object is. … The weight of an object is the amount of material it contains.  


  • Ounce
  • Pound  
  • Ton 


Ounces is the smallest unit of weight. 

The abbreviation for ounces is ‘oz’ 

1 ounce weight is same like a slice of a cheese, butter or a quart.  



When we have so many ounces we move to this unit. 

16 ounces is equal to 1 pound

The abbreviation for pound is ‘lb’ 

1 pound weight is same like a loaf of bread, football.  



2000 pounds is equal to 1 ton. 


Ton is called Ton(T) only in short form. 

1 Ton is also equal to 32000 ounces. 

Heavy equipment like Ship, Car are measured in Ton 


Some basic Customary Unit of Weight and relation between

Some basic Customary Unit of Weight and relation between

Quantity of Customary Units of Weight (Approximate) 

  1. 1 ounce weight is same like a slice of a cheese butter or a quart. 
  1. 1 pound weight is same like a loaf of bread, football. 
  1. Heavy equipment like Ship, Car are measured in Ton  

Conversion between the Units of Weight 

To Convert larger unit to smaller unit we multiply

To convert smaller unit to larger unit we divide

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

Conversion between the Units of Weight 

1. 8 lb.  = _____ oz. 


1 lb. = 16 oz 

So, 8 lb. = 8 × 16 = 128 oz 

2. 12 ½ lb. = _____oz. 


1 lb. = 16 oz 

So, 12 ½ lb. = 12 ½ × 16 oz = 200 oz 

3. 64 oz = _____lb. 


1 lb. = 16 oz, So 1 oz = 1/16 lb. 

Now, 64 oz = 1 ÷ 16 × 64 

= 4 lb. 

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

Example: Mrs. Mary handed out 4 ounces of peanuts to each of her 20 students. How many pounds of peanuts did Mrs. Mary hand out? 

Solution: Peanuts of almonds handed out to 1 student is 4 ounces. 

Total no. of ounces of peanuts handed out for 20 students is  

= 4 × 20 

=  80 ounces  

Convert ounces into pounds. 

=  80 ÷ 16 pounds 

= 5 pounds 

So, Mrs. Mary handed out 5 pounds of peanuts

Concept Map

Concept Map


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