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This printable worksheet may be useful: Temperature.
Introduce the boiling and freezing point of water in Celsius and Fahrenheit.
The freezing point of water is $0^\circ C$ and $32^\circ F$.
The boiling point of water is $100^\circ C$ and $212^\circ F$.
Spend lots of time discussing how to deduce information from the initial temperature facts given. Perhaps it would help students to suggest new values if the information is presented in a table.
Scientists often use the Kelvin scale of temperature, where the freezing point of water is $273.15^\circ K$ and the boiling point of water is $373.15^\circ K$.
Is there a temperature at which Kelvin and Fahrenheit readings are the same?
Is there a temperature at which Kelvin and Celsius readings are the same?
Can you describe ways of converting Kelvin readings into Fahrenheit and Celsius readings?