# Plan of Units of Mass/ Weight

## Students` Learning Outcomes

• Read standard units of mass/weight (Kilogram and gram) using abbreviations.

### Information for Teachers

• The basic unit of mass is kilogram.
• Kilogram is used for heavy weight.
• Gram is used for light weight.
• The letters “kg” is used as an abbreviation for kilogram and “g” for gram.
• “Kilo” means one thousand. 1kg =1000g.

• Make the following charts and display in the classroom.

### Material / Resources

Writing board, chalk/marker, duster, tooth paste; bath soap; medicine bottle; jam jar; sack of rice; packs of ghee; sack of flour; tea box all packs are empty; 1kg weight; 500g weight

### Introduction

• Show 1kg weight to students. Look at this (14kg) weight.
• Have you ever seen it before?(at vegetable shop)
• What unit is written on this weight? (1kg)

• Tell them “kg” is the abbreviation of kilogram. This unit is used to measure the mass./weight of heavier thing e.g. flour, rice, potatoes, fruit etc. are weighted in kg.
• “g” is the abbreviation of gram. This unit is used to measure the lighter mass/weight.
• The ornaments of gold and silver ware weighted in g.
• Medicines are also weighted in g.
• One gram is much, much lighter weight than 1kg.

### Development

Activity 1

• Show some objects on which mass is mentioned in g or kg.
• Tooth paste; bath soap; medicine bottle; jam jar; packs of ghee; sack of flour; tea box.

• Call the students one by one, ask them to pick anything from table.
• Ask from students what is the weight mentioned on these objects.
• What is the weight mentioned on tooth paste? (50g)
• What is the weight mentioned on bath soap?(small pack 80g)
• What is the weight written on medicine bottle?
• Weight mentioned on jam jar .(250g)
• Weight written on tea box. (500g)
• Now show them different pack of ghee.
• Tell them that;

• Show the empty sack of flour to the students and ask them. “How much “kg” flour was in this sack?” (20kg)

Activity 2

• Ask the students one by one to indicate one of the items in the classroom whose mass can be measured in grams.
• Make a list on the board under the column heading “items whose weight can be measured in g”
• Then ask the students one by one to indicate the one item ijn the classroom whose mass can be measured in kilograms.
• Make a list on the board under the heading
“items whose weight can be measured in kg”

### Sum up / Conclusion

• Sum up the concept by telling:
• The basic unit of mass is kilogram.
• We measure the heavy object in kilogram and the light object in grams.
• We write “kg” for kilograms and “g” for grams.

### Assessment

• Ask the following questions to the students.
• Which unit of mass/weight which unit of mass/weight is used to the measure the weight of earrings of gold?
• Which unit of mass/weight is used to measure the weight of boy?
• What is the abbreviation for gram?
• What is abbreviation for kilogram?
• How many grams are in 1 kilogram?
• How many grams are in half kilogram?
• How many grams are in quarter kilogram?
• Visit a grocer`s shop, read and write the weight of at least five things in different packing in notebook.
• Ask the students to solve the questions given in the textbook.