First step: figure out how much one pizza costs. If a quarter of a pizza costs $5, it figures that one pizza costs
5
×
4
=
$
20
. This is worked out mathematically by dividing the cost by the amount of pizza:
5
1
4
=
20
Now you can work out how much pizza you get for $8 by doing the same in reverse: dividing $8 by the cost for one whole pizza:
8
20
=
0.4
=
2
5
