Changing temperatures

This task is about addition and subtraction with negative numbers.
snow on the hills

Question 2Change answer

a)  On Friday morning the temperature was ⁻2°C. By the evening it was ⁻11°C. 
     By how many degrees did the temperature change during Friday?   °C
 
b)  On Saturday evening the temperature was 6°C. On Sunday morning it was ⁻7°C. 
      By how many degrees did the temperature change during the night?   °C

Question 1Change answer

c)  At midday on Monday the temperature was 7°C. By the end of the day it had decreased by 15°C.
     What was the temperature at the end of the day?   °C
 
d)  On Tuesday morning the temperature was ⁻4°C. By the afternoon it had increased by 9°C.
     What was the temperature in the afternoon?   °C
 
e)  On Wednesday evening the temperature was ⁻5°C. By Thursday morning it had decreased by 8°C.
     What was the temperature on Thursday morning?   °C