# Chemistry Significant Figures Guided Inquiry Lesson (Counting & Rounding)

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1.49 MB   |   39 pages

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Significant Figures Guided Inquiry Lesson
This is a student-centered, active learning lesson without lecture or notetaking!

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Texas Chemistry Standards (TEKS)
C.2.G: The student is expected to express and manipulate chemical quantities using scientific conventions and mathematical procedures, including … scientific notation, and significant figures.

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Lesson Summary:
This guided inquiry lesson enables students to construct their own understanding of how to determine the number of significant figures in a value. They also discover how to round calculated answers to the correct number of digits. Students are able to actively learn the material without lecture or note taking.

Part 1: Counting Significant Figures
• Students analyze a list of numbers grouped by the number of significant figures in each value. They develop a set of rules indicating when a digit should be counted as significant.

• Students assemble a puzzle that requires them to identify the number of significant figures in several values.

Part 2: Rounding Numbers
• Students compare the rounding mechanism for numbers that are rounded to the right of the decimal to the rounding mechanism for numbers that are rounded to the left of the decimal.

• Students participate in a task card scavenger hunt which requires that they practice rounding numbers to a specified number of significant figures.

Part 3: Calculations
• Students compare the rule for rounding the answers to multiplication/division calculations to the rule for rounding the answers to addition/subtraction calculations.

• Students work through eight task cards which require them to calculate and round their answers to the proper number of digits.

Student Study Sheet
Students are provided with a student study sheet summarizing all of the important concepts in this lesson.

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Learning Objectives (Bloom’s Revised Taxonomy):
Remembering: Identify the number of significant figures in a measurement.
Understanding: Explain the difference between rounding to the right of a decimal and rounding to the left of a decimal.
Applying: Contrast how to round the answer to a multiplication or division calculation with how to round the answer to an addition or subtraction calculation.
Analyzing: Perform simple calculations and round the answers to the correct number of digits.
Evaluating: Discuss why it is important to properly round the answers to calculations involving measurements.

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Included in this Download:
• Cover page (1 page)
• Guided inquiry lesson (5 pages)
• Colorful handout (1 page)
• Rounding task card set - 6 different questions per card (3 pages)
• Calculation task card set – 6 different versions (12 pages)
• Task card answers (1 page)
• Task card answer sheet (2 pages)
• Significant Figures Puzzle – 6 different versions (6 pages)
• Student study sheets (1 pages)
• Teacher notes (2 pages)
• Guided inquiry lesson with suggested answers (5 pages)

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Kendo's Chemistry Store
Total Pages
39
Answer Key
Included
Teaching Duration
50 Minutes

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