Adding and
Subtracting Decimals
Performance Task Objectives
 Read and write decimals
to thousandths
 Compare, order, and round
decimals to hundredths
 Add and subtract decimals
 Interpret and display data
on bar graphs
Sunshine State Standards
Materials
 Student recording sheet
 Centimeter graph paper
 Paper and pencil
Student arrangement
 Individual or small group
Task
Present the problem on the student Recording Sheet to your students.
Performance Criteria
 Does the student correctly
interpret the data on the chart?
 Does the student use a reasonable
scale for the bar graph?
 Does the student label the
bar graph accurately?
 Is the student able to order,
round, and compare the decimals in the problem?
Directions:
1. Using the given data, construct a bar graph showing the batting averages
of these National league batting champions.
National
League Champions

Year

Player

Batting
Average

1988

Tony
Gwynn

.313

1989

Tony
Gwynn

.336

1990

Willie
McGee

.335

1991

Terry
Pendleton

.319

1992

Gary
Sheffield

.330

Using the data and your graph,
complete the following activities.
2. List the players’ averages in order from the highest batting average
to the lowest batting average.
3. How much better is the batting average of the player with the highest
average than that of the player with the lowest average? How do you know?
4. If rounded to the nearest hundredth, which players will have the same
average?
5. Write two statements about the batting averages as shown on your graph.
