Negative Emotions: A Look at the Differences Why not start from the beginning of this contextual 6-day unit of real world lessons from the Make Math Moments Problem Based Units page.
Three (3) additional number talk prompts are available in Day 5 of the Rising Water problem based math unit that you can dive into now. Offer additional subtraction sentences where the difference is 7 degrees such as:Īfter this string, students should feel convinced that if the current temperature is greater than the initial temperature, the difference should be positive.Ĭan we generalize a rule for subtracting integers where the minuend is larger than the subtrahend? Want to Explore These Concepts & Skills Further? It is worth noting that the difference between 7 degrees and 0 degrees is the same difference between 12 degrees and 5 degrees. It is important to model student thinking with the number line so that they are later able to leverage the number line as a tool for thinking when we begin working with negative temperatures. Again, we want to model this using the number line despite most students firmly knowing and understanding the difference is 7 degrees Celsius in order to encourage the use of the tool for more challenging differences coming later in the string.Īgain, students are given a very low floor opportunity to not only find the difference between a higher temperature and a lower temperature using the number line as a tool to represent their thinking. In this set of visual number talks, we give students yet another opportunity to wrestle with integer subtraction using the linear context of temperature.Īs we did on Day 3 of this real world math unit, we begin with rising temperature from one positive temperature to another positive temperature resulting in a positive difference. Visual Math Talk Prompt #1Ĭonstruct a subtraction sentence to represent and determine the difference in temperature. For example, if I add 10 to both -3 and -10, my equation is 7 – 0. Encourage students to adjust these values along the number line to defend their answer. Students will quickly realize that all four expressions have the same difference, they are simply adjusted down the number line by subtracting the same amount from both the minuend and the subtrahend. In this set of visual number talk prompts, we will explore the first two (2) of the five (5) related problems from Day 5 of the Rising Water problem based unit :įacilitator note : The first four expressions are part of a string. Model student thinking on the open number line. How much warmer is it? The temperature rose from to -9 degrees to -2 degrees, how much warmer is it? Encourage students to use an open number line to defend their answer. For example, the temperature rose from 5 degrees to 12 degrees.
Create a context that encourages students to leverage the subtraction structure of difference. Present the following subtraction sentences one at a time. Students will explore integer subtraction through a real world contextual situation involving rising and falling temperatures.
In This Set of Visual Number Talk Prompts… Investigate subtracting negative numbers by finding the difference in temperature using the thermometer as a linear model number line.
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