Example 1
There are 240 bananas in 8 boxes. How many bananas are
there in one box?
8 boxes > 240 bananas
1 box > ? bananas
240÷8 = ? = 30
1 box > 30 bananas.
There are 30 bananas in one box.
We have found this solution b dividing the number of
bananas by the number of boxes. This is basically the
reverse of what we have done in the example above.

1 CD

4 CDs

Example 2
There are 84 people in 21 cars. How many people are there
in one car?
21 cars > 84 people
1 car > ? people
84÷21 = ? = 4
1 car > 4 people
There are 4 people in one car.
We have found this solution using the same method as in
the example above.

Example 1
There are 140 breads sold in 7 hours. How many breads are
sold in 9 hours?
7 hours > 140 breads
9 hours > ? breads
140÷7 = 20
1 hour > 20 breads
20×9 = 180
9 hours > 180 breads
180 breads are sold in 9 hours.
We have solved this problem by finding out how many
breads are sold in 1 hour and then multiplying this value by
9. This is the unitary method in action.

Example 2
A lift can transport 75 tourists in 3 rides. How many tourist
can be transported in 100 rides?
3 rides > 75 tourists
100 rides > ? tourists
75÷3 = 25
1 ride > 25 tourists
25×100 = 2500
100 rides > 2500 tourists
2500 tourists can be transported in 100 rides.
We have solved this problem using the unitary method (by
finding how many tourists are transported in 1 ride.) We
then multiplied this value by 100 to find how many were
transported in 100 rides.

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Chapter 9.2: Learning Outcomes
Students will be able to solve simple proportional problems!
Students will be able to find answers to proportional problems using the
unitary method!

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