In addition of mass we will learn how to add the different units of mass or weight together.

Let us learn how to add different units of mass.

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 can add two or more units of mass given in kilogram and grams like ordinary numbers. Always express grams as 3-digit numbers for example 3 g = 003 g.

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
8 5 7 5  g

+  4 8 9 7  g
1 3 4 7 2  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     5 7 5

+   4     8 9 7
1 3      4 7 2

= 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

4. Add 6 kg 135 g and 11 kg 954 g.

Solution:

 Arrange the numbers vertically.First, add the grams.135 + 954 = 1089 g = 1000 g + 89 gWrite 89 under grams column and carry over 1 kg to kilograms column. Add the kilograms.6 + 11 + 1 (carry over) = 18 kg

Write 18 kg under the kilograms column.

Hence, 6 kg 135 g + 11 kg 954 g = 18 kg 89 g.

5. Add: 45 kg 726 g, 23 kg 12 g and 7 kg 53 g.

 Solution:Let us addStep I: Arrange the numbers vertically.Step II: Write the weights to be added in kg and g as shown here.Step III: First add grams from right and then add the kilograms.

Thus, 45 kg 726 g + 23 kg 12 g + 7 kg 53 g = 75 kg 791 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.

(i) 23 kg 084 g + 16 kg 214 g

(ii) 32 g 132 mg + 57 g 265 mg

(iii) 34 kg 000 g + 19 kg 075 g

(iv) 44 kg 725 g + 15 kg 200 g

(v) 70 kg 600 g + 18 kg 504 g

(vi) 41 g 800 mg + 12 g 200 mg + 33 g 082 mg

I. (i) 39 kg 298 g

(ii) 89 g 397 mg

(iii) 53 kg 75 g

(iv) 59 kg 925 g

(v) 89 kg 104 g

(vi) 87 g 82 mg

(i) 23 kg 673 g, 10 kg 98 g and 5 kg 600 g

(ii) 38 kg 900 g, 17 kg 547 g and 12 kg 621 g

(iii) 56 kg 411 g, 21 kg 561 g and 8 kg

(iv) 156 kg 32 g, 441 kg 198 g and 158 kg 200 g

(v) 200 kg 500 g, 279 kg 679 g and 134 kg 450 g

(vi) 250 kg 60 g, 45 kg 100 g and 90 kg 300 g

(vii) 180 kg 110 g, 170 kg 85 g and 60 kg 50 g

(viii) 310 kg 500 g, 105 kg 180 g and 15 kg 50 g

(ix) 75 kg 350 g, 150 kg 200 g and 225 kg 175 g

II. (i) 39 kg 371 g

(ii) 69 kg 68 g

(iii) 85 kg 972 g

(iv) 755 kg 43 g

(v) 614 kg 629 g

(vi) 385 kg 460 g

(vii) 410 kg 245 g

(viii) 430 kg 730 g

(ix) 450 kg 725 g

(i) 23 kg 345 g, 12 kg 120 g and 5 kg 78 g

(ii) 127 kg 437 g, 67 kg 790 g and 34 kg

(iii) 904 kg 230 g, 14 kg 780 g and 17 kg 495 g

(iv) 33 kg 480 g, 348 kg 560 g and 70 kg 30 g

(v) 65 kg 632 g, 121 kg 12 g and 130 kg

III. (i) 405 kg 543 g

(ii) 229 kg 227 g

(iii) 936 kg 505 g

(iv) 452 kg 70 g

(v) 316 kg 644 g

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