Operations with Matrices Practice
Complete this assessment to review what you've learned. It will not count toward your grade.
4 of 54 of 5 Items
Question
Use the tables to answer the question.
Number of Books Checked Out This Year
Teens Adults
Fiction 450 875
Self-Help 325 560
Historical 255 745
Biographies 180 620
Number of Books Checked Out Last Year
Teens Adults
Fiction 420 880
Self-Help 315 545
Historical 275 740
Biographies 175 635
The librarian at a local library is keeping track of how many of each type of book is checked out by teens and adults. Find the difference between the data for this year and last year.
(2 points)
Differences in Number of Books Checked Out
Teens Adults
Fiction
Self-Help
Historical
Biographies
Skip to navigation
To find the difference between the number of books checked out for each category and each age group, you simply need to subtract the numbers from last year from the numbers from this year.
For example, to find the difference in the number of Fiction books checked out by teens:
450 (this year) - 420 (last year) = 30
Repeat this process for each category and age group to find the following differences:
Teens:
Fiction: 450 - 420 = 30
Self-Help: 325 - 315 = 10
Historical: 255 - 275 = -20
Biographies: 180 - 175 = 5
Adults:
Fiction: 875 - 880 = -5
Self-Help: 560 - 545 = 15
Historical: 745 - 740 = 5
Biographies: 620 - 635 = -15
Therefore, the differences in the number of books checked out for each category and age group are as follows:
Teens:
Fiction: 30
Self-Help: 10
Historical: -20
Biographies: 5
Adults:
Fiction: -5
Self-Help: 15
Historical: 5
Biographies: -15