In this section, we will use our knowledge from previous section to build our understanding of integer addition. We will be asked to write addition statements using arrows on number lines. A thermometer is just like a number line. In this section, the blue arrows on the number lines will move to the left, or down the number line, and represent negative integers. A negative integer on a thermometer would represent a cooler temperature. In this section, the red arrows will move to the right, or up the number line, and represent positive integers. A positive integer on a thermometer would represent a warmer temperature.