So you simply divide the field into two halfs and then count the number of fields in one half.
Steps:
Write the number as a fraction.
Turn the second fraction upside down.
Multiply the numerators
Multiply the denominators
Reduce if necessary
A step by step example:
Two is simply written as a fraction.
The rule is:
To divide, you turn the second fraction upside down and then you multiply.
This has been reduced.
;-)
This is what it would look like in the JFractionLab.
In JFractionLab you have to reduce as you go along.
If you are not sure how this works, have a look at the chapter "Reducing fractions" and "Multiplying and reducing fractions"!
Another example: What is a third of three fifths?
You divide the field into three rows of the same size and count the number of fields in one of them!
This is what it would look like in the JFractionLab.