 # 10.07 Measure and estimate mass

Lesson

## Ideas

Think about a feather and an elephant. Which one of those items do you think would be heavier?

## Units of mass

This video introduces the units of grams, and kilograms and discusses the types of objects that would be measured by these units.

### Examples

#### Example 1

Which unit is best to measure the mass of this cup of flour?

A
Kilograms
B
Grams
Worked Solution
Create a strategy

Remember that 1 kilogram is equal to 1000 grams.

Apply the idea

A cup of flour is small and light like a bar of chocolate.

So the correct answer is B: Grams.

Idea summary

A gram has a mass similar to a piece of paper, or a feather. A kilogram has a mass similar to a 1 litre bottle of milk or juice.

The prefix can help with identifying the size of the units.

kilo - means "one thousand of", so a kilogram has 1000 grams.

## Scales

This video looks at measuring the mass of objects using a scale.

### Examples

#### Example 2

The scale below shows an object balanced evenly with a particular set of weights.

The following weights were on the scale:

What is the total mass of the object?

Worked Solution
Create a strategy

Find the total mass by adding all the values on the given weights.

Apply the idea

We can see there is one 5\text{ kg} weight, two 2\text{ kg} weights and three 1 \text{ kg} weights.

Idea summary

We can measure the mass of objects with different types of scales. Mechanical scales are just like a number line, but in a circle.

### Outcomes

#### MA2-12MG

measures, records, compares and estimates the masses of objects using kilograms and grams