It was -8°F in the morning. The temperature increased throughout the day, and in the afternoon, it was 11°F. How much did the temperature change?

19

Step-by-step explanation

This is simple

I will teach you a simple technique

Count them, don't count the -8

-8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11

You are just subtracting, but instead counting.

I said not to count -8, because normally in subtraction, we normally don't count the number we are subracting.

for example

8 - 7 = 1

so counting technique

8 - 7, 6, 5, 4, 3, 2, 1

there are 7 numbers, if i didn't count the 8

so it is right.

hope you understand :-)

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step-by-step explanation:

step-by-step explanation: