So if your students have trouble adding and subtracting positive and negative numbers, you definitely won’t want to not teach them “The System.” Image provided by GECC, LLC with permission ...

To add -4 and 5, draw the starting number on a number line and count to the right when adding positive numbers. So, \(-4 + 5 = 1\) Subtracting with negative numbers ...

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 ...