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Grade 7 - Mathematics
5.5 Temperature Conversion using Formula - Fahrenheit and Celcius

The temperature in Celcius degrees 'C' can be changed to Fahrenheit degrees 'F' by the formula F = (1/5)*(9C+160). Make C the subject of the formula, then find C when F = 212 degrees.
F = (1/5)*(9C+160)
Multiply both sides with 5, we get
5F = 5*1/5*(9C+160)
5F = 9C+160
5F-160 = 9C
5(F-32) = 9C
C = 5/9*(F-32)
If F = 212 degrees
Substitute F value in above equation, we get
C = 5/9*(212-32)
C = 5/9*180
C = 5*20
C = 100 degrees.

Directions: Solve the following problems and show your work. Also write at least ten examples of your own.
Q 1: Change 0 degree Celcius degrees into Fahrenheit.
45 Fahrenheit degrees
32 Fahrenheit degrees
None of these
15 Fahrenheit degrees

Q 2: Change 5 degree Celcius degrees into Fahrenheit.
None of these
41 Fahrenheit degrees
55 Fahrenheit degrees
35 Fahrenheit degrees

Q 3: Change 15 degree Celcius degrees into Fahrenheit.
84 Fahrenheit degrees
None of these
59 Fahrenheit degrees
65 Fahrenheit degrees

Q 4: Change 77 degree Fahrenheit degrees into Celcius.
45 Celcius degrees
35 Celcius degrees
25 Celcius degrees
None of these

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Question 6: This question is available to subscribers only!

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