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Unit 1: Mass
Activity 1.1 - Working with units of mass
Remember: The standard (SI) units used to measure mass
are kilograms and grams.
I can write kilograms as kg and grams as g.
1 kg = 1 000g
1. Converting and adding.
Copy and complete.
1
a. 4kg = ____g
b. 500g = ____kg
d. 1kg = ____g
e. 12kg = ____g
1
3
c. 4kg = ____g
f. 2 000g = ____kg
I hope Mr Brown will like my snails. I don’t think
the snails will like him.
Super Snails Recipe:
750g snails.
200g cheese.
225g butter
100g garlic.
320g chopped onion.
50g chopped parsley.
g. What is the total mass of all the ingredients? Write your answer in kilograms.
h. What is double the mass of all the ingredients?
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2. Increasing kilograms and grams.
250g flour
300mℓ milk
2 eggs
1 pinch salt
a. Convert this pancake recipe for 4 people to a recipe for 6 people.
b. Convert this pancake recipe to a recipe for 12 people.
c. Convert this recipe to a recipe for 24 people.
Activity 1.2 - Reading scales
5kg
5,25
5,5
5,75
6kg
6,25
Each interval line represents 250g or 0,25kg.
5kg
5,1
5,2
5,3
5,4
5,5
5,6
5,7
5,8
5,9
6kg
6,1
Each interval line represents 100 g or 0,1kg.
Look at the scales on the following page and write the mass indicated by the letters A – Z.
Use decimal form.
Write just the letter and the mass in your book.
Remember to write kg or g after your answers.
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Activity 1.3 - Kilograms (kg) and grams (g)
A teaspoon holds approximately 5 mℓ.
1. Appropriate units of measurement.
• Choose the correct unit of measurement for each food item.
• Write the letter and the best estimate.
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2. Calculate the total mass of the groceries. Copy and complete the table.
Food
peas
jam
margarine
cheese
flour
sugar
Total mass
g
410g
kg
0,410 kg
g
kg
3. Conversions. Copy and complete the table.
g
1 265g
Example:
a.
b.
c
d.
e.
f.
g.
h.
i.
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≈ kg
1kg
kg
1,265kg
7,321kg
39kg 18g
426
14 725
12,514kg
8kg 706g
13kg 3g
20 634
9,016kg
4. Copy and complete the table.
in green.
Example:
a.
b.
c.
d.
e.
kg and g
1kg 265g
1kg
1kg
2kg
3kg
5kg
8kg
300g
250g
0,3kg
1,5kg
0,3kg
3,25kg
0,2kg
0,4kg
500g
400g
1kg
500g
Colour the blocks so that their sum equals the amount
0,1kg
150g
50g
350g
0,25kg
2kg
250g
50g
700g
500g
2,5kg
800g
350g
0,3kg
0,25kg
0,6kg
300g
0,75kg
450g
550g
150g
0,2kg
600g
700g
500g
0,2kg
0,6kg
300g
0,4kg
1,5kg
550g
100g
100g
0,1
200g
50g
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Activity 1.4 – Reading recipes
Read the recipes. Each recipe is for 4 people.
1. Which recipe uses the most:
a. flour?
b. butter?
c. sugar?
2. Which recipe uses the least:
a. chocolate?
b. sugar?
c. flour?
3. Rewrite the measurements to make each recipe for twelve people.
Activity 1.5 - Problem solving
1. A shopkeeper sold 15,216kg of flour on Monday, 17, 742kg on
Tuesday and 2,907kg on Wednesday. He took the flour from a 50kg
bag. How much flour was left in the bag?
2. A tin of fruit jam has a mass of 440g. There are 48 tins in a box. What will the mass of
the box be? Write your answer as a decimal.
3. Lindi bought a packet of sweets with a mass of 3kg and paid
R30,75. How much would a 2kg bag of sweets cost?
4. A crate of apples has a mass of 56kg. If
still be sold?
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of the apples are bruised, how many kg can