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Maths
Summary
Mass is how you describe how heavy an object is. You can compare the weights of objects using mass and you can use a weighing scale or balance to find and compare masses of objects.
Heavier objects have greater mass, so a $500g$ pot is heavier than a $100g$ fork. Remember that you can only compare masses if they have the same unit; a $150g$book is not heavier than a $5kg$ chair! Use this equation to convert between units:
$1000g = 1kg$
1.  Make sure the units are the same. 
2.  Identify what the question is asking you:

3.  Convert the answer back into appropriate units (if required). 
How much heavier is a $2.3kg$ paperweight compared to a $750g$ bottle of water?
$2.3kg = 2300g$
$2300  750 =\underline{1550g}$
What is the combined weight of the paperweight and the bottle of water?
$2.3kg = 2300g$
$2300 + 750 = \underline{3050g}$
FAQs
Question: What is the biggest unit of mass?
Answer: The largest unit of mass is the kilogram (kg).
Question: Is mass the same as weight?
Answer: The two terms can be used interchangeably, however mass is not the same as weight.
Question: What units are used to measure mass?
Answer: The units gram (g) and kilogram (kg) are used to measure mass.
Theory
Exercises
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