Hot and Cold Cubes If the chefs added 3 hot cubes and then removed 2 cold cubes, the combined result would be to raise the temperature 5 degrees. The mathematical representation for this would be: +3 (-2) = +5 – And if they wrote -5 - +6 = -11 it would mean that 5 cold cubes were added and then we removed 6 hot cubes. The combined result would be to lower the temperature 11 degrees. So how would you subtract the following? Be ready to explain your reasoning (-5) (-8) – 12 (-3) – (-4) 6 – 5 7 – How can this help you with subtracting with variables? What do you (-5x) (-8x) would be? Why? – Activity 3 Work on the following and be to explain your thinking 3m 6m – x (-x) – (-4p) 8p 2p – – 4m - 8m + 3m - 6m Why do the methods we use in arithmetic work the same with variables?
Hot and Cold Cubes If the chefs added 3 hot cubes and then removed 2 cold cubes, the combined result would be to raise the temperature 5 degrees. The mathematical representation for this would be: +3 – (-2) = +5 And if they wrote -5 - +6 = -11 it would mean that 5 cold cubes were added and then we removed 6 hot cubes. The combined result would be to lower the temperature 11 degrees. So how would you subtract the following? Be ready to explain your reasoning (-5) – (-8) 12 – (-3) (-4) – 6 5 – 7 How can this help you with subtracting with variables? What do you (-5x) – (-8x) would be? Why? Activity 3 Work on the following and be to explain your thinking 3m – 6m x – (-x) (-4p) – 8p – 2p 4m - 8m + 3m - 6m Why do the methods we use in arithmetic work the same with variables?