

2.1
Experiencing Negative Numbers
In the beginning of this section, we showed different situations where you could come into contact with negative numbers. We will looks a bit more at these examples and give you some questions to think about: 
 Temperature
If the temperature is 4ºC on a winter day, and the temperature lowers by 3ºC, in other words, it becomes 3ºC colder, how cold then is it? Which of these two temperatures would you call the coldest?
 Money
If you loan 150,000 kr from the bank for a car, you owe the bank 150,000 kr, or that you have a balance in the bank of 150,000 kr. If you loan another 70,000 kr, what is your balance with the bank?
 Riding in an Elevator
Imagine that you are standing in an elevator which has the buttons 2, 1, 0, 1, 2, 3, 4 (0 normally represents the lobby). What do the buttons 2 and 1 really mean? Which is the lowest floor?
 Sea Level
The surface of the Dead Sea is 392 m under what we call sea level. Because sea level is 0 m, we write this as 392 m. Parts of the Netherlands lay also under sea level and the lowest point lies 6.7 m under sea level, in other words 6.7 m. Which is closest to sea level, the Netherlands or the surface of the Dead Sea? Which of the numbers 6, 7, and 392 is the largest and which is the smallest?
 Time Zones
If Chile has GMT (Greenwich Mean Time) –5 hours and the times is 12:00 in Greenwich. Is the time more or less in Chile? What is the time in Chile?



