Texas Instruments TI-15 Teachers Manual page 10

Patterns in Percent
How can you make a similar table for 10% to
compare your data?
What do you think would happen if you order
the total quantity amounts from least to
greatest?
How else might you organize your data to
compare the two tax rates and find patterns in
the percents?
Analyzing Data and Drawing Conclusions
To focus students' attention on looking for patterns
in their data, ask questions such as:
How are the percentages (amounts of tax) in
your 5% table like the amounts in the 10% table?
How does 5% of a $20 item compare to 5% of a
$10 item?
How does 10% of a $20 item compare to 10% of
a $10 item?
How does 10% of the cost of an item compare to
the total cost of the item?
What conjectures can you make about finding
10% of a number?
What conjectures can you make about finding
5% of a number?
How can you use manipulatives to test your
conjectures?
Continuing the Investigation
Students can create other percent scenarios to
investigate patterns in percents. For example, ask
students:
What happens if you increase the sales tax by
one percentage point each day?
How does the tax on a $20 item change each
day?
How does the tax on a $40 item change each
day?
How do the taxes on the 2 items compare?
© 2000 T I
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TI-15: A Guide for Teachers
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