Chapter 12.3 (Mathematics 5)

Addition of Grams and Kilograms

Addition of grams and kilograms without conversion

Group Activity 5

The mass of a cabbage is 2 kg 500 g and that of watermelon is 3 kg 400 g. What is the mass of the two items?

In pairs:

  1. Set the addition of the mass of items in a vertical form.
  2. First add the grams. Write the sum in the grams column.
  3. Then add the kilograms and write the sum in the kilograms column.

kg g 2 500 + 3 400

  1. Discuss the result and share with other groups.

Example 3

A mason mixed 10 kg 150 g of cement with 30 kg 450 g of sand. What was the mass of the mixture?

kg g Mass of cement: 10 150 Mass of sand: + 30 450 Mass of mixture: 40 600

Exercise G

a) kg g 5 175 + 3 1 30

b) kg g 7 5 497 + 73 305

c) kg g 32 643 + 83 6 52

a) kg g 1 93 565 + 102 170

b) kg g 235 645 + 490 232

c) kg g 377 750 + 398 120

  1. 59 kg 248 g + 168 kg 436 g =
    =  kg  g
  2. 435 kg 65 g + 49 kg 589 g =
    =  kg  g
  3. 208 kg 702 g + 82 kg 98 g =
    =  kg  g

Answer. The total mass was
 kg  g.

Answer. The total mass was
 kg  g.

Answer. The mass of the loaded pickup was
 kg  g.

Addition of grams and kilograms with conversion

Group Activity 6

Odera bought a fish of mass 3 kg 800 g and a cock of mass 2 kg 400 g. What was the total mass of the fish and the cock?

In pairs:

  1. Set the addition of the mass of the fish and the cock in a vertical form.
  2. First add the grams, 800 g + 400 g.

kg g 3 800 + 2 400

  1. Rename the grams into kilograms and grams.
  2. Write the grams in the grams column and transfer the kilograms in to kg column.
  3. Add the kilograms together. Write the answer in the kilograms column.
  4. Discuss the results and share with other groups.

Example 4

Add 56 kg 580 g + 63 kg 870 g

  1. Add 580 to 870 to get 1450 g.
  2. 1 450 g = 1 kg 450 g. Write 450 g in the grams column.
  3. Take the 1 kg to the kg column and add it to 56 kg and 63 kg to get 120 kg.
  4. Write 120 kg in the kg column.

kg g 56 580 + 63 870 120 450

or

kg g 56 580 + 63 870 119 1 450 119 1kg450g 120 450

Exercise H

a) kg g 5 250 + 6 850

b) kg g 23 605 + 45 920

c) kg g 49 415 + 138 728

a) kg g 69 478 + 90 620

b) kg g 217 107 + 120 922

c) kg g 156 630 + 87 480

  1. 995 kg 450g + 620 kg 472 g =
    =  kg  g
  2. 76 kg 231 g + 23 kg 942 g =
    =  kg  g
  3. 87 kg 450 g + 35 kg 735 g =
    =  kg  g
  4. 236 kg 236 g + 127 kg 158 g =
    =  kg  g

Answer. The total mass he carried was
 kg  g.

Answer. The total mass of the goats was
 kg  g.