It is 'Blast Off' which can be written as zero. Get out the thermometer and ask a student what they think the temperature is. Place the thermometer in the cup of ice. Get the students to watch as the temperature drops. When it reaches zero, explain to the students that zero does not mean there is no temperature, but rather it signifies a division between the melting and freezing point of water.
Students learn, then that zero can be a separation point.
Of course, the answer is neither. In the same way if you are playing a game of marbles and you start with 10 and end with 10, you have broken even, or made zero profit. C. Closure 1. Review the three principle understandings about zero.