Subtracting integers

Subtract using a number line.
1. (+5) – (+2)
2. (+9) – (+7)
3. (-10) – (-3)
George lives 15 floors up from street level in his apartment. He rides down the elevator from his room to a parking level that is two floors below street level. How many floors does he ride down in total?
The temperature recorded in Whitehorse, Yukon on Christmas day is -20 degrees Celsius. On the same day in Hawaii, the temperature is + 25 degrees Celsius. What is the temperature difference between these two places?
Subtracting 1-digit Integers Vertically– Like Signs
Subtract the following integers vertically.
1. $(+5)-(+2)$
2. $(+3)-(+9)$
3. $(-2)-(-6)$
4. $(-9)-(-7)$
Subtracting 1-digit Integers Vertically – Unlike Signs
Subtract the following integers vertically.
1. $(+3)-(-4)$
2. $(-1)-(+6)$
Subtracting 2-digit integers Vertically
Subtract the following integers vertically.
1. $(+36)-(+79)$
2. $(-47)-(-82)$
3. $(+53)-(-28)$
4. $(-25)-(+66)$