In addition of mass we will learn how to add the different units of mass or weight together. While adding we need to follow that the units of mass i.e., kilogram and gram are converted into grams before addition and then follow the simple addition process.

We will learn two different methods to solve addition using the standard unit and smaller unit of mass. Students can practice both the methods.

(i) Adding units with conversion into gram

(ii) Adding units without conversion into gram

Worked-out examples on addition of mass:

1. Add 7 kg 350 g and 2 kg 150 g

Solution:

Method 1 (with conversion into gram):

We know, 1 kg = 1000 grams

Now kg and g are converted into grams before doing addition and then we need to follow the simple addition process.

7 kg 350 g = (7 × 1000) g + 350 g = 7000 g + 350 g = 7350 grams

2 kg 150 g = (2 × 1000) g + 150 g = 2000 g + 150 g = 2150 grams

Now sum,

1
7350 g

+
2150 g

9500 g

= 9 kg 500 g

Therefore, 7 kg 350 g + 2 kg 150 g = 9 kg 500 g

Method 2 (without conversion into gram):

Here kg and g are arranged in different columns and then added like ordinary numbers.

kg       g
1
7     350

+   2     150
9     500

= 9 kg 500 g

Therefore, sum of 7 kg 350 g and 2 kg 150 g = 9 kg 500 g

2. Add 8 kg 575 g and 4 kg 897 g

Solution:

Method 1 (with conversion into gram):

We know, 1 kg = 1000 grams

Now kg and g are converted into grams before doing addition and then we need to follow the simple addition process.

8 kg 575 g = (8 × 1000) g + 575 g = 8000 g + 575 g = 8575 grams

4 kg 897 g = (4 × 1000) g + 897 g = 4000 g + 897 g = 4897 grams

Now sum,

1 1 1
8575 g

+  4897 g
13472 g

= 13 kg 472 g

Therefore, 8 kg 575 g + 4 kg 897 g = 13 kg 472 g

Method 2 (without conversion into gram):

Here kg and g are arranged in different columns and then added like ordinary numbers.

kg        g
1      1 1
8     575

+   4     897
13     472

= 13 kg 472 g

Therefore, sum of 8 kg 575 g and 4 kg 897 g = 13 kg 472 g

3. Add 17 kg, 13 kg 940 g and 15 kg 65 g

Solution:

Here kg and g are arranged in different columns and then added like ordinary numbers (without conversion into gram).

kg        g
11        1
17     000

13     940

+  15     065
46     005

= 46 kg 005 g

Therefore, sum of 17 kg, 13 kg 940 g and 15 kg 65 g = 46 kg 005 g

The above problems on addition of mass will help the students to practice the worksheet on adding the different units with conversion or without conversion.

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