Measuring Mass (or weight)

Mass is a measure of how heavy something is. We use a balance scales or a weighing scales to measure mass (or weight)

Mass is measured in grams (g) and kilograms (kg). We use grams to weigh lighter objects and kilograms to weigh heavier objects.

1 kg = 1000g

Or

1000g = 1kg

The standard unit of measurement of mass is Kilogram.

Conversion of kg into g

In order to convert kilograms into grams we multiply by 1000

Example: Change 4 kg into grams.

Since 1 kg =1000g

4kg = 4 x 1000g

      = 4000g

Note: In conversion of unit, we always multiply when we go from higher unit to lower unit; such as from kg to g.

Addition

Step1: Add the gram column

Step2: Add the kg column

Example 1:

Add 75kg 582g and 13kg 410g

Example 2:

Add 94kg 215g and 6kg 757g

Example 3:

Ravi purchased 5kg 300g of a packet of rice and 4kg 200g of a packet of wheat flour. How much is the total weight of both the packets?

Solution:

Weight of rice = 5kg 300g

Weight of wheat flour = 4kg 200g

Total weight of both the packets = 5kg 300g + 4kg 200g

Subtraction

Step1: Subtract the gram column

Step2: Subtract the kg column

Example1:

Subtract 13kg 410g from 75kg 582g

Example2:

Dev weighs 39kg 900g. Manit weighs 35kg 600g. Who weighs more and by how much?

Solution:

Dev’s weight = 39kg 900g

Manit’s weight = 35kg 600g

Dev weighs more by = 39kg 900g – 35kg 600g