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What is mass?

Comparing mass | Year 3 Mathematics

Mass is a fundamental property of matter that indicates how heavy an object is. In everyday measurements, we use grams (g) and kilograms (kg) to quantify mass.

  • Grams are employed when measuring the mass of relatively lighter items, such as fruits like apples or bananas. For instance, you would use grams to weigh a small bag of candy or a mobile phone.
  • Kilograms come into play when determining the mass of heavier objects, like a sack of potatoes or a person. For example, you would use kilograms to weigh a dog or a bicycle.
    1000 g = 1 kg

Key Concepts

  • When comparing masses, symbols like greater than (>), equal to (=), and less than (<) are essential.
  • The direction of the arrow always points towards the smaller number for ease of comparison.

Solved Examples

Example 1: Kemi and Mariella's Bags of Sweets
Kemi and Mariella both bought a bag of sweets. Kemi’s bag weighed 1300 g and Mariella’s bag had a mass of 1 kg and 500 g. Who had the heavier bag?
Kemi's bag weighed 1300 grams, which is equivalent to 1 kilogram and 300 grams.
Mariella's bag had a mass of 1 kilogram and 500 grams.
To compare the weights accurately:

  • Kemi had 1 kilogram 300 grams
  • Mariella had 1 kilogram 500 grams

Mariella's bag was heavier, as 1300 grams is less than 1 kilogram 500 grams.

Example 2: Doughnuts vs. Fruit
Look carefully at the measurements shown on the scales.
Comparing mass | Year 3 Mathematics

The weight of the doughnuts is 500 grams, while the fruit weighs 5 kilograms. To compare their weights, it's important to convert them into the same units. Let's convert both weights to grams for easier comparison.
The doughnuts are already in grams, so no conversion is needed for them. For the fruit, which is 5 kilograms, we convert kilograms to grams knowing that 1 kilogram equals 1000 grams:
5 kg = 5000 g
Now that both weights are in grams, we can compare them directly: 5000 grams versus 500 grams.
5000 grams is greater than 500 grams.
Therefore, the fruit is heavier than the doughnuts.

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FAQs on Comparing mass - Year 3 Mathematics

1. What are the key differences between mass UK schools and private schools?
Ans. Mass UK schools are state-funded institutions that follow the national curriculum and do not charge tuition fees, while private schools are independent institutions that charge fees and have more control over their curriculum and admissions process.
2. How are students typically admitted to mass UK schools?
Ans. Students are typically admitted to mass UK schools based on their home address and proximity to the school, as well as any specific admission criteria set by the school such as sibling attendance or special educational needs.
3. What support services are available to students in mass UK schools?
Ans. Mass UK schools provide a range of support services to students, including special educational needs support, counseling services, and extracurricular activities to enhance student well-being and academic performance.
4. What are the main challenges facing mass UK schools today?
Ans. Some of the main challenges facing mass UK schools today include budget cuts, teacher shortages, and the pressure to meet academic standards set by the government.
5. How do mass UK schools prepare students for exams such as the GCSEs?
Ans. Mass UK schools prepare students for exams such as the GCSEs by providing a structured curriculum, exam preparation materials, and practice tests to help students succeed in their exams.
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