**Lesson Plan Day: 20 **

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**Teacher: P. Kirk**

**Subject: Science**

**Course: Chemistry**

**Topic: Using Significant Figures in addition and subtraction calculations.**

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** NGSS: **

**C.PM.1: Atomic structure, Evolution of atomic models/theory**

C.PM.2: Periodic Table

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**Objectives:**

**Students have learned how to round. Unfortunately, they did not learn when
to round or why to round. We round to the significance of the measuring
devices we use. Apply the addition and subtraction rule to determine the
sig figs in the resulting answer of this kind of calculation.**

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**Vocabulary:**

** Significant Figures**

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**Student:**

**The students will learn and practice the identification of significant
figures. There are five rules for the identification of sig figs. They will
apply the addition and subtraction rule to determine the sig figs in the
resulting answer of this kind of calculation. Students will practice these
skills on EA2B.**

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**Teacher:**

**The teacher will use notes and example problems to demonstrate the
application of the five rules and identify sig figs and the addition and
subtraction rule to determine the sig figs in the resulting answer of this
kind of calculation. Teacher will create, publish and evaluate progress on
EA2B.**

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** Resources:**

**Sig Fig Notes, Sig fig introduction sheet copies, Sig Figs Level I / Sig
Figs Level II work sheet copies, EA2B**

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**Evaluation:**

**Sig fig introduction, Sig Fig Level I are practice sheets. Students will
check answers. Teacher will monitor student progress. Sig Fig Level II will be
collected for a grade. There will be a grade on EA2B. There will be a quiz
covering the combined skills of sig fig identification and sig figs in
calculations (addition and subtraction) and (multiplication and division.) **