Question

At '$12$‘ noon, the temperature was ’$38°C$‘ above zero. At ’$1$‘ pm, the temperature was ’$5°C$' below the temperature at noon. Find the difference between the two temperatures.

Answer 1

Step:Finding the difference of temperature's.

⇒ The temperature above $0°C$ is denoted by a ‘$+$’ sign and the temperature below $0°C$ is denoted by a ‘$-$’ sign,

So, The temperature at $12$ noon $=38°C$above $zero$$=+38°C$.

The temperature at $1$ pm $=$$5°C$ below the temperature at noon$=38°C-5°C$

$=33°C$

⇒ The difference between the two temperatures$=38-33$

$=38+\left(-33\right)$ ($\because$ In subtraction, we add the additive inverse of the number to be subtracted)

$=5°C$ ($\because$$\left|38\right|>\left|33\right|$, So we shall subtract $33$ from $38$ and will use the sign of $38$)

Therefore, the difference between the two temperatures is $5°C$