CHAPTER 4
WORKING ON WASTE AT SCHOOL
INTRODUCTION
There are many different ways to
take care of and protect the environment. What are some of the things
you can do to preserve and protect the environment at home and at school?
MATERIALS
grid paper
a ruler
coloured pencils
a calculator
TASK
Your class has been chosen to be the startup class for a vermicomposting
program at your school. Vermicomposting means composting with worms.
The principal of your school would like your class to do some Internet
research on the subject and make a presentation using the data you find.
You will need to find out the following:
 general information on vermicomposting
 the quantity of worms and bins you would need for one classroom
 the number of classrooms that will be vermicomposting after one
year
 the amount of castings your worms will have produced after 36 weeks
and after 90 weeks.
 Use the Web links below to research and write a brief report on
one of the following aspects of vermicomposting. Then present your
report to the class.
 possible building materials for bins
 types of bedding material and the quantity needed
 what foods to feed your worms
 feeding techniques
 harvesting the compost
 possible problems and how to solve them
Click on the following links
to find out more about vermicomposting. Consult at least three sites
for your research.
SWRC
 Vermicomposting
Compost
Action Project: Vermicomposting
Featured
Themes  Waste
Composting
with Worms
TIP: When you are looking
for specific information on a Web page, scan the text instead of reading
all of it from start to finish. To begin, do not read every word of
the texts but look through them quickly. For example, if you are looking
for information on what to feed worms, look at the section headings
first and focus on sections that are related to this subject, such
as a section titled "Feeding Worms".
 Use the information on the Web sites to decide on the number of
bins and the quantity of worms (in kg) you will need for your class.
Be sure to include the size of the bins in your answer. Explain your
thinking and show all your work.
Keep the following in mind when making your decision:
You will be creating waste from only one meal
a day and snacks, five days a week. So divide the number of people
in your class by 2 since you will be producing about half as much
waste as an average person.
Some students will need to volunteer to
take care of the worms at their homes over the holidays and the summer.
This means the bins need to be appropriate for an averagesized family.
 Worms reproduce at a rapid rate, which is good news because the
more worms you have, the more classes you can get vermicomposting.
 Using the information below, decide how many bins you could set
up after one school year (from September to June).
Worms are able to reproduce
at two months old.
Worms double in number every
two months.
When you have double the
number of worms, you need double the number of bins

Complete the table
of values to display your results.

Write the rule for the pattern.

How many classrooms will this number of bins supply?

The castings that the worms produce can be used as fertilizer.
450600 worms can produce 18 litres of castings in 9 weeks.
 Click on this link Compost
Action Project: Vermicomposting to find out how many worms
are in a half a pound.

How many litres of castings can 1 pound of worms produce? How
many pounds of worms does your class have?

Complete the table
of values to show the minimum amount of castings your worms
could produce in 36 weeks.

Write a pattern rule for the number sequence in the table.

Write the next four terms in the sequence.

Create a scatter plot to predict the minimum amount of castings
your worms could produce in 90 weeks.
TASK CHECKLIST 

Did you include a diagram, tables of values, and
a scatter plot? 

Did you show your steps and explain your thinking? 

Did you use appropriate math vocabulary? 