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Joshua buys half a kilo of cheese and Oliver buys 250 grams of cheese.

Level 3-4 Shapes - Measuring Mass

Measure mass accurately in KS3 maths. Read scales on balances, choose sensible units like grams and kilograms, convert amounts, and solve real problems about weighing objects and ingredients.

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Fascinating Fact:

A penny coin weighs about 3.5 grams, so 100 of them would have a mass of roughly 350 grams.

In KS3 Maths, mass tells us how much matter is in something. You will read analogue and digital scales, choose between grams and kilograms, and convert values to compare and solve problems.

Key Terms

Mass: How much matter an object contains. Measured in grams (g) or kilograms (kg).
Gram / Kilogram: Metric units for mass. 1,000 g = 1 kg.
Tare (zero): Setting a scale to zero so the container’s mass is not counted.

Frequently Asked Questions (Click to see answers)

How do I read a kitchen scale accurately?

Place the scale on a flat surface, press tare to zero with the empty container, add the item, then read the display at eye level using the shown unit.

How do I convert grams to kilograms and back?

Divide by 1,000 to change g to kg (750 g ÷ 1,000 = 0.75 kg). Multiply by 1,000 to change kg to g (1.2 kg × 1,000 = 1,200 g).

What is the difference between mass and weight?

Mass is the amount of matter and stays the same. Weight is a force caused by gravity acting on mass, so it can change on different planets.

Try These Related Quizzes

1 .

Charlotte buys two jars of jam each weighing 400 grams, two bags of sugar each weighing a kilo and three tubs of yoghurt each weighing 100 grams. What is the total weight of her shopping?

2.9 kilos

3.1 kilos

3.3 kilos

4.0 kilos

Make sure that you understand that a kilo is 1,000 grams and that 400 grams is 0.4 of a kilo

2 .

How many grams are there in one kilogram?

100

1,000

1,000,000

'Kilo' means 'thousand'

3 .

What is the name given to 1,000 kilograms?

tun

ton

tonne

tunne

A 'ton' is the name given to 2,240 pounds in imperial measurement

4 .

How many grams are there in 13 kilograms?

130

1,300

13,000

130,000

Just multiply 13 x 1,000 for the answer

5 .

Joshua buys half a kilo of cheese and Oliver buys 250 grams of cheese. What is the difference between these two amounts?

150 g

200 g

250 g

300 g

Half a kilo = 500 grams. The abbreviation g = grams

6 .

Emily weighs 4.5 kilos more than Sophie. What is the difference in their weights in grams?

450

2,250

4,500

9,000

Multiply 4.5 x 1,000 for the answer

7 .

A lorry is delivering to shops and at the start of the day the lorry contains 10 tonnes of potatoes. The first shop takes 500 kilos of potatoes and the second shop takes 2.5 tonnes of potatoes. How many potatoes are left on the lorry?

5.0 tonnes

7.0 tonnes

7.5 tonnes

9.5 tonnes

500kg = 0.5 tonnes so 10 - 0.5 - 2.5 = 7 tonnes

8 .

Peter has collected a number of 1p coins and he finds that one coin weighs 3¹⁄₃ grams. He then weighs all the coins together and they weigh 666 grams. Approximately how much are the pennies worth?

50p

£1.00

£1.50

£2.00

666g ÷ 3¹?₃ = 199.8 which we can round up to 200. So, 200 coins each worth 1p means that Peter's collection is worth £2.00

9 .

What is the name given to 100 kilograms?

Megagram

Mellagram

Monogram

There is no name for 100 kilograms

Metric weights go up in thousands, not hundreds

10 .

Ruby has 3 kilos of sugar, Megan has half as much as Ruby and Ellie has half as much as Megan. How much sugar does Ellie have?

1.5 k

1.0 k

750 g

500 g

Don't forget that k = kilo and g = gram

You can find more about this topic by visiting BBC Bitesize - Weight and Mass

Author: Frank Evans (Specialist 11 Plus Teacher and Tutor)

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