1. Algebra
Library
Chapter 1: Pre-Algebra Concepts
Lesson 2.5: Applications of Rational Numbers
Practice
Use the temperature conversion formula to convert given
Fahrenheit temperatures to Celsius temperatures. Express your
results as rational numbers.
5
C = (F – 32)•
9
5
Value of F Value of (F – 32) Value of (F – 32)•
9
32
100
212
–100
-250
The recipe on the left is for 12 cookies. Suppose you wanted to make
30 cookies (or 2½ times the standard recipe). Adjust the recipe on the
right. Express your result as rational numbers.
1

2. Algebra
Library
Chapter 1: Pre-Algebra Concepts
Lesson 2.4: Dividing Rational Numbers
Answer Key
5
Value of F Value of (F – 32) Value of (F – 32)•
9
32 0 0
100 68 7
37
9
212 180 100
–100 –132 1
–73
3
–250 –282 2
–156
3
2