Measure, estimate, order and compare objects

You may have learned about measuring quantities and estimating capacities, ordering objects by their capacity, or comparing objects using capacity.

Now we will review each of these topics.

 

Measuring quantities

We can measure quantities using containers with measurement scales. This means we can work out the exact amount in a container by reading the scale. Watch this video to learn about reading measurement scales.

Try this question for yourself.

 

Worked example

Question 1

 

Comparing objects

We can compare objects by different measurement attributes such as, length, height, weight or capacity.

First, we make sure the objects are in the same measurement unit, for example, metres. Then, we can compare their value. Watch this video to learn more about comparing objects.

Try this question for yourself.

 

Worked example

Question 2

 

Estimating measurements

We can use comparisons of objects to estimate the size of different attributes. For example, if we know an elephant weighs $5000$5000 kilograms, we might estimate a rhinoceros weighs $2500$2500 kilograms as it is approximately half the size.

You may have learned about fractions before. Now watch this video to learn more about estimating measurements, some strategies use our fraction knowledge.

Now try these questions for yourself.

 

Worked examples

Question 3

Question 4

 

Measuring and interpreting

We can use measurement tools to evaluate attributes. First, we check the measurement unit, then we read the results.

It is also important for us to interpret what the values mean. For example, if one person is $160$160 cm tall and another is $170$170 cm, halfway between them would be $165$165 cm.

Sometimes we use multiplication to help us interpret measurements. You may have learned about multiplication before. Now watch this video to learn more about measuring and interpreting results.

Now try these questions for yourself.

 

Worked examples

Question 5

Question 6