Qualitative/Quantitative Lesson 6 "Addition & Subtraction of Significant Figures"
Science and Technology Standards:
PA Standard 3.2.12B
Purpose:
1. I will determine the number of significant figures.
2. I will multiply and divide with significant figures.
Homework Due:
1. Significant Figures and Addition and Subtraction and Multiplication/Division WS #1: 10 - 12, & 14
2. Significant Figures and Multiplication/Division WS #1: 13 - 16, & 25 -32
3. Section 2.8 Notes (Due Lesson 7)
*Quantitative Class Only
Handouts/Supplies:
1. Metric Ruler
2. 50 mL and 400 mL Beakers
3. 10 mL, 100 mL, and 250 mL Graduated Cylinders
4. Water
5. “Significant Figures.ppt”
I. Introduction
Opening Assignment:
Warm-Up: Measure the length and width of your Significant Figures and Multiplication/Division WS.
Check over the homework:
1. Significant Figures and Addition and Subtraction and Multiplication/Division WS #1: 10 - 12, & 14
2. Significant Figures and Multiplication/Division WS #1: 13 - 16, & 25 -32
3. Section 2.8 Notes (Due Lesson 6)
*Quantitative Class Only
Review warm-up
State the purpose
II. The Lesson:
Activity #1: Review warm-up (A Review of Section 2.5)
Activity #2: Calculate the area of the paper and compare results
Activity #3: Review rules for multiplication and division of significant figures
Activity #4: Review multiplication and division problems using the following:
1. Significant Figures and Addition and Subtraction and Multiplication/Division WS #1: 10 - 12, & 14
2. Significant Figures and Multiplication/Division WS #1: 13 - 16, & 25 -32
Activity #5: Discuss addition and subtraction of significant figures (”Significant Figures.ppt”)
Activity #6: Complete the following measuring activity:
1. Fill a 400 mL beaker to the 150 mL mark
2. Fill a 50 mL beaker to the 40. mL mark,
3. Fill a 100 mL graduated cylinder to the 30.0 mL mark
4. Fill a 10 mL graduated cylinder to the 10.00 mL mark
5. Add each to a 250 mL graduated cylinder and measure
Activity #7: Review the measuring activity results and discuss the reason(s) for the uncertainty in the final measurement
Activity #8: Complete addition and subtraction problems using the Significant Figures and Addition and Subtraction and Multiplication/Division WS #1: 1 - 9, 13, & 15
III. Closure:
Summary Assignment:
Assess today's
lesson
Round the following to the correct number of significant figures:
1. 67.41 + 0.032 = ____________ 67.442 -> 67.44
2. 732.01 + 4 = ____________ 736.01 -> 736
3. 97000 - .0212 = ____________ 96999.9788 -> 97000
Homework Assignment (Write down in planners):
1. Significant Figures and Addition and Subtraction and Multiplication/Division WS #1: 1 - 9, 13, & 15
2. Section 2.8 Notes (Due Lesson 7)
*Quantitative Class Only
Preview of Next Class:
1. Addition,
Subtraction, Multiplication, and Division with
Significant Figures
2. Density
Page maintained by: Stephen A. Roe
Last update: Wednesday, January 31, 2007 9:57 PM
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