Draw arrows on the number lines to represent the situation:
(1.) The temperature was -5 degrees. Then the temperature rose 5 degrees.
(2.) A climber was 30 feet above sea level. Then she descended 30 feet.5 degrees.
Adding Signed Numbers by Applying Changes in Elevation.
A mountaineer is climbing on a cliff. She is 200 feet above the ground. If she climbs up, this will be a positive change. If she climbs down, this will be a negative change.
Write an addition equation from the data above.
Complete a Table.
A cave researcher is down in a cave next to the cliff. If she climbs down deeper into the cave, this will be a negative change. If she climbs up, whether inside the cave or out of the cave and up the cliff, this will be a positive change.
(1.) Write an addition equation for C and D:
(2.) What does the expression -45 + 60 tell tell us about the spelunker?
(3.) What does the value of the expression tell us?
Work with Directed Numbers.
These problems are intended to be completed WITHOUT the use of a calculator.
One of the particles in an atom is called an electron. It has a charge of -1. Moreover, there is a proton with a charge of +1. The charge of an atom is the sum of the charges of the electrons and the protons. Complete the table.