Knowing Negative Numbers
0 is neither positive nor negative; below zero uses negatives
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Zero is neither positive nor negative — it is the dividing point: 8 degrees above zero is written +8, and 5 below zero is −5. Dial the temperature up and down and watch the thermometer and number line move together, meeting positive numbers, negative numbers and 0 in a concrete setting.
Dial the temperature up and down and watch the thermometer and number line move together: 8 above zero is +8, 5 below zero is −5. Zero is the dividing point — neither positive nor negative.