## Reflection: Intervention and Extension The Sieve of Eratosthenes: Prime Numbers, Multiples & Inverse - Section 5: Showing Their Videos

Explanation of the Sieve, Take One!

This movie sample was one sample that found its way on my email and I was glad she had sent it to me. While her paper showed me that she could utilize the Sieve to find her prime numbers, she is apparently still unsure of what this is all about yet. I will take time to help her rehearse her explanation. When I had visited her prior to her video, she could point and show me exactly what numbers were prime. This particular situation, I need to take time to have her plan what she wants to say prior to shooting a video. I just wanted to share this because it looks like she doesn't understand what she is doing, but she does. She needed rehearsal and help clarifying what she wanted to say before she got in front of the camera, where some students can just cut a movie and explain without any inhibition. It is a good thing for me to remember before I do this type of assessment again.

Intervention and Extension: Movies reveal understanding or lack of...

# The Sieve of Eratosthenes: Prime Numbers, Multiples & Inverse

Unit 9: Division Unit
Lesson 10 of 21

## Big Idea: Using an interactive website, students use the Sieve of Eratosthenes to help them discover prime numbers, understand divisibility and inverse relationships between multiplication and division.

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Standards:
Subject(s):
Math, Factoring (Number Sense), multiples, Prime and Composite, division, number and
58 minutes

### Mary Ellen Kanthack

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