## Reflection: Complex Tasks Heart Rate and Respiration - Section 2: Guided Practice

During this lesson, students are taking their pulse and counting their breaths for 30 seconds. In order to record their data as breaths and heart beats per minute, students must multiply their 30 second count by 2. I was very surprised to find that doubling numbers was very difficult for my students. Doubling is a basic concept of multiplication and the vast majority of my students have demonstrated mastery of multi-digit multiplication at this point in the school year. Because of their high math assessment data, I did not anticipate that doubling would provide any difficulty for my students. They were all successful at doubling numbers prior to exercise, however, I had to provide students with a lot of support after they took their heart and respiration rates after exercise. In the future, when I teach this lesson, I will be sure to review strategies for doubling numbers prior to teaching the lesson.

Mathematical Difficulties

# Heart Rate and Respiration

Unit 3: Human Body Systems
Lesson 5 of 8

## Big Idea: Heart rate and respiration change with exertion. The changes correlate.

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65 minutes

### Meredith Gannon

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