## Math 6A, Lesson 10, Spring 2017, 4/30/2017

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Math 6A, Lesson 10, Spring 2017, 4/30/2017

1. Percentage increase

• Increase = Increased_value – Original_value
• Percentage increase = ( Increase/ Original_value) x 100%
• Increased_value = (100% + Increase %) x Original_value

2. Percentage decrease

• Decrease = Original_value – Decreased_value
• Percentage decrease = (Decrease / Original_value) x 100%
• Decreased_value = (100% – Decrease %) x Original_value

3. Home Work:

• Handout two pages
• Page 40: 9, 10, 11
• Page 42: 19, 20, 21

## Math 6A, Lesson 9, Spring 2017, 4/23/2017

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Math 6A, Lesson 9, Spring 2017, 4/23/2017

1. Go over quiz with students, one by one.

2. Review rate and ratio word problems: unit rate, rate unit conversion, average rate, etc. Class work two pages. Go over each problem one by one.

3. Reverse Percentage

• In a box, 15% of the balls are green. If there are 54 green balls, find the number of balls in the box.
• In the library, the fine for not returning a book on loan is 125% of the price of the book. If the fine for a book that was not returned was \$90, find the price of the book.

4. Home Work:

• Handout one page
• Page 40: 8
• Page 41: 14, 15, 16, 17
• Redo the problems in last quiz if your  score is under 32/40 (80%)

## Math 6A, Lesson 8, Spring 2017, 4/9/2017

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Math 6A, Lesson 8, Spring 2017, 4/9/2017

1. Quiz: rate and ratio word problems

2. Percentage

• Meaning of percentage: a percentage is a fraction with 100 as the denominator.

38% = 38/100 = 0.38

100% = 100/100 = 1

• Decimals, percentages and fractions and how to express a number in each form
• Express one quantity as a percentage of another
• Compare quantities using percentage
• Word problems involving percentage

3. Home Work:

• Handout one page
• Page 39: 1, 2, 3, 4, 5
• Page 40: 6, 7

## Math 6A, Lesson 7, Spring 2017, 4/2/2017

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Math 6A, Lesson 7, Spring 2017, 4/2/2017

1. Average Rate

• Rate involves two quantities and it is usually expressed as one quantity per unit of another quantity.
• \$/oz, mile/gal, words/min, \$/sq.ft, \$/hour

2. Speed, uniform/constant speed and average speed

• Speed = (distance traveled) / (time taken)
• Average Speed =  (total distance traveled) / (total time taken)

3. Conversion of units

• km/hr → m/s → miles/hr
• \$/inch → \$/ft
• \$/ticket → euro/ticket

4. Home Work:

• Page 34: 5, 6, 7, 8, 9, 10
• Page 35: 11, 12, 13, 14, 15, 16, 17
• Page 36: 18, 19, 20, 21, 22