What are positive and negative numbers? Any number above zero is a positive number. Positive numbers are written with no sign or a '\({+}\)' sign in front of them and they are counted up from zero to ...

To add -4 and 5, draw the starting number on a number line and count to the right when adding numbers. What is the difference in temperature between a desert at 40 °C and a mountain top at -2 °C? \(40 ...