
Web Quests
CHAPTER 4
PIZZA PARTY
TASK CONTEXT
In this Web Quest, students will continue their work with addition and
subtraction of whole numbers and decimals. The task will focus on estimating,
calculating the cost of purchases, and determining the change they will
receive. Working in groups, students will decide on a pizza party order
for 28 students with a budget of $75.00.
EXPECTATIONS
5m7 select and
perform computation techniques appropriate to specific problems involving
whole numbers, decimals, and [equivalent fractions, and] determine whether
the results are reasonable
5m9
justify in oral and written expression the method chosen for calculations:
estimation, mental computation, concrete materials, algorithms, or calculators
5m30 use
mental computation strategies to solve number problems
5m33
select operations and solve twostep problems involving whole numbers
and decimals with and without a calculator
5m35
explain their thinking when solving problems involving whole numbers [fractions,]
and decimals
5m36 use
and explain estimation strategies
5m52 make purchases of
and change for items up to $100
MATERIALS
pencil and paper
calculator (optional)
base ten blocks (optional)
RESOURCES
Pizza shop Web sites:
www.pizzapizza.ca
www.241pizza.com
INSTRUCTIONAL PROCESS
 As a class, read the Introduction, Task, and Process sections of
the Student page. Answer any questions that may arise.
 Divide students into groups. Have them discuss possible menu choices
and the quantity of food they think they will need. You may want groups
to appoint a secretary to record the group's order. Make sure students
justify the estimation strategy they used to come up with the rough
order.
 Once the groups have a good idea of what and how much food they will
need, have them go to www.pizzapizza.ca
or www.241pizza.com.
Students can browse the Web site for prices. You may want to suggest
that the students look for special deals available.
 Have the students estimate the total cost of their purchases based
on the prices they find on the Web site. Ask them to record their work.
Encourage them to use estimation strategies such as rounding and regrouping.
If they are over budget, have them make changes to their order. While
groups are working, interview or observe students to see how they are
interpreting and carrying out the task.
 Have each group make a final copy of their order, which includes
the price of each item and the quantity of each item.
 Have them calculate the total cost of their order and the amount
of change they will receive if they give the pizza delivery person $75.00.
 As a class, moving from one group to the next, find out how much
each group spent on their pizza party. For an extra challenge, after
each group shares how much they spent, have students calculate the difference
in spending from the previous group.
MEETING INDIVIDUAL NEEDS
 Allow students to use calculators and base ten blocks to help them
add and subtract.
 The number of students and the budget can be changed to offer a greater
or lesser challenge.
 This task could also be done individually or in pairs, instead of
in groups.
ASSESSMENT

LEVEL
1 
LEVEL
2 
LEVEL
3 
LEVEL
4 
Understanding
Concepts 
• demonstrates a superficial
or inaccurate understanding of estimating and adding or subtracting
2digit numbers and decimals 
• demonstrates a growing but
still incomplete understanding of estimating and adding or subtracting
2digit numbers and decimals 
• demonstrates
a grade appropriate understanding of estimating and adding or subtracting
2digit numbers and decimals 
• demonstrates
an indepth understanding of estimating and adding or subtracting
2digit numbers and decimals 
Application of
Procedures 
• makes major error and/or
omissions when estimating, adding, or subtracting quantities and
prices 
• makes several
errors and/or omissions when estimating, adding, or subtracting
quantities and prices 
• makes only a few errors and/or
omissions when estimating, adding, or subtracting quantities and
prices 
• makes almost
no errors when estimating adding, or subtracting quantities and
prices 
Communication

• provides an incomplete or
inaccurate justification for estimates of quantity and cost
• creates a order that lacks
clarity or logical thought 
• provides a partial justification
for estimates of quantity and cost
• creates a
order that exhibits some clarity and logical thought 
• provides
a complete, clear, and logical justification for estimates of quantity
and cost
• creates a
order that is complete, clear, and logical 
• provides a thorough and clear
justification for estimates of quantity and cost
• creates a order that is
clear, logical, and shows creative problem solving 

