The students model on their number line the mold growth on the pizza over two consecutive time periods. They then calculate the total elapsed time over the two periods of time.
Episode Supports
Focus Questions
For use in a classroom, pause the video and ask these questions:
[Pause the video at 2:27] Can you use logarithmic expressions to represent the elapsed time from when there was 1 gram of mold to when there was 55 grams of mold?
[Pause the video at 3:37] Why do you think Arobindo estimates i hours to be between 1 and 2?
Supporting Dialogue
Ask students to summarize Josh and Arobindo’s discussion about why log355 represents the total elapsed time.
MathTalk