1. Welcome to Math112 Class #6 10-8-14
Don’t turn in HW yet! Review this week’s HW AND last week’s HW AND the sample test. We will go over any questions you have for 15 minutes. Test #2 will begin at 7:15.

2. Tonight’s Agenda Warmup
Go over questions from sample test or any homework assigned
Test #2
Fractions, Decimals, & Percents

3. Three small rules for living a happy life:
1. Start each day with a grateful heart. 2. Focus on the positive aspects of every person you encounter. 3. End each day with a grateful heart. Lucy MacDonald

4. Answers to HW Worksheet p
Answers to HW Worksheet p. 24 “Why did the ant run across the cracker box?”

5. Answers to HW Worksheet p. 62 “Can you build this?”

6. When you finish, take a break. Class will begin at __________.
Test #2
When you finish, take a break.
Class will begin at __________.

7. Rounding Numbers

8. Objective - To round decimals to a specified place value.
Rounding Numbers
Look at the digit to the right of where you are rounding.
1. If the digit is 4 or less, round down.
2. If the digit is 5 or more, round up. 1) 3)
Round to the nearest hundred. 5) 2) 4) 6)

9. Round to the nearest hundredth.1) 3) 5) 2) 4) 6) 1) 2)
Round to the given place value. 3)

10. Fractions, Decimals, and Percents

11. Ordering Decimals
Put the following decimals in order of size, starting with the one with the least value: 0.125, 0.4, 0.62, 1.05, 0.05

12. Ordering Fractions
Put the following fractions in order of size, starting with the one with the least value:

13. Which number is larger?
40% or ¼
0.7 or 3/5
33% or 0.4

14. Handout

15. Decimal to percent and Percent to decimal

16. Writing Decimals as Percents

17. Fraction to percent and Percent to fraction

18. Writing Fractions as Percents
Decimal
Percent

19. Write each fraction as a percent.

20. Write each percent as a fraction.

21. Decimal to fraction

22. Converting Decimals to Fractions
Just read it correctly!
Fraction
Two and three-tenths
Fourteen hundredths
Two and four-
hundredths

23. Complete the table.
Fraction
Decimal
Percent

24. Complete the table.
Fraction
Decimal
Percent

25. Percent change = Difference between the two values x 100% The starting value

26. Example 1
The price of a parking ticket in LA has increased from $50 to $75. What is the percent increase?

27. Example 2
The price of a pair of pants has decreased from $60 to $40. What is the percent decrease?

28. Real world use of percents
Discount, Commission, Profit, and Interest

29. - Discount A pair of shoes that was originally $80 is on sale
Original Price
Discount =
New Price
A pair of shoes that was originally $80 is on sale
for 40% off. Find the amount of the discount and
the new price.
Discount
New Price
Subtracts
the
Money
Subtracts
the
Percents

30. THE TRIANGLE IS A SYMBOL FOR THE WORD
Finding the Percent Mark-up
A baseball glove that was purchased wholesale
for $60 is now selling retail for $72. Find the
percent mark-up.
Percent Mark-up
Percent Change
From $60 to $72
THE TRIANGLE IS A SYMBOL FOR THE WORD
“CHANGE” 12 =
0.2 60
20%
Mark-up

31. Mark earns a 12% commission on all the cars he
sells. He expected his sales in July to be $35,000, What commission was he expecting?
Expected

32. Mark earns a 12% commission on all the cars he sells
Mark earns a 12% commission on all the cars he sells. He was only able to sell $28,000. How much
commission did he earn?
Actual

33. Mark earns a 12% commission on all the cars he
sells. He expected his sales in July to be $35,000,
but he was only able to sell $28,000. How much
less were his commissions than expected?
Expected
Actual

34. Objective - To solve problems involving simple interest.
If someone borrows money, what factors influence
how much is paid back?
Principal -
How much was borrowed.
Time -
How long it was borrowed for.
(in years)
Rate -
What interest was charged.
(annual % rate)
Amount to Payback =
Principal +
Interest
Interest =
Principal
Rate
Time

35. Joe borrows $200 from the bank at 6% simple
interest for 3 years. What interest does he owe,
and what is his total balance (amount to payback)?
Interest
Balance
Balance = P + I
Balance =
200 + 36
Balance = 236
Balance = $236

36. Juan invests $5000 in bonds for 6 months at an
annual interest rate of 7%. How much interest
did he earn, and what is the balance in his account?
Interest
Balance
Balance = P + I
Balance =
5000 +
175
Balance = 5175
Balance = $5175

37. Homework #6 (worksheets)
Worksheet:“Fractions, Decimals, and Percents (Revisited)” Worksheets pp