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METRIC WEIGHT UNITS
GRADE 3

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Hello, How are you doing?
Today, we are going to start a new lesson on weight.

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Mass
The amount of matter in an object is termed as mass.
Example – The mass of a box is 4 Kg.

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Weight
Weight - A measurement that tells how heavy an object is.
Example – the backpack weighs 5 pounds.
1 pound (lb) = 16 ounces (oz)
1 ton = 2,000 pounds

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Metric Unit of mass
Metric Units of mass are-
Kilogram (Kg)
Gram (g)
1 Kilogram (kg) = 1,000 gram (g)

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Examples
Kilogram is a bigger unit.
Objects with more mass are measured in Kilogram.
Examples – cycle, car, telephone
Objects with less mass are measured in grams.
Example – paper pins, pencils

7. Is 960 grams more or less than a kilogram?
Answer- 960 grams is less than a Kilogram as 1 Kg = 1,000 grams
960 grams < 1,000 grams

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Conversion Unit
To Convert Kilogram (kg) to gram (g)- Multiply with 1,000
Example- 5 Kg = 5 x 1,000
= 5,000 grams
To Convert grams (g) to Kilogram (kg)- Divide with 1,000
Example – 6,000 g = 6,000/1,000
= 6 Kg

9. How many grams are there in 9 Kg?
Answer- 9,000 grams

10. Chooser the better estimate for a boat.
1,000 g
1,000 Kg
100 g

11. Use + or – to make the equation true.
a) 500 g О 500 g = 1 kg
b) 1500 g О 500 g = 1 Kg
Answer – + -

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Manuel caught a fish with a mass of 2 Kilogram. Did the fish weigh more or less than 1300 gram?
Answer- More than 1300 g

13. Would you use kilogram or gram to find the weight of the building?
Answer- Kilogram (kg)

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Write True or False.
5 Kg is less than 3299 grams
Mass of an object does not depend on the size of an object.
Answer-
False
True

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ASSESSMENT

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1. Which has more mass?
A kite
An ice cream
An egg
A potato

17. Complete the number sentence. 2500 g + ----- = 4 kg
Answer gm

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3. Which has more mass? a) b) c)
Answer- a

19. 4. A Kitten has a mass of 3,000 grams. What is its mass in Kilograms?
Answer – 3 Kg

20. 5. Choose the better estimate of a pair of sunglasses.
150 grams
150 kilograms
1500 grams
1500 kilograms

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6. An orange has a mass of 100 grams. What is the mass of 20 oranges in kilograms?
Answer- 2 Kg

22. 7. Compare using >, < or =
a) 5 Kg О 5,000 g
b) 6 Kg О 6325 g
c) 2 Kg О 1251 g
Answer- =
<
>

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8. What metric unit of mass would you use to measure the mass of a pack of 5 books?
Answer- Kilogram (kg)

24. 9. Kilogram is used to measure ----.
Length
Capacity
mass

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List the items from greatest to least mass. Bicycle, trunk of banana tree, book
Answer- trunk of banana tree, bicycle, book

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Recap
Mass
Weight
Metric units
Examples
Solved Examples
Unsolved Problems

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Good Work!
Now Practice worksheets on the Lesson.