thursday, october 3, 2019 · 10/3/2019 · 9/26/19 2.1b hw 39 9/27/19 recipe project 2.2 and 2.3...

Thursday, October 3, 2019

• Ch 2 Test (Sections 2.0 to 2.6) Friday, October 18.

• Extra Credit due Thursday, October 10, 2019

• HW: TB82 #19, 20, 29-32all

2.4 Notes: Add and Subtract Decimals

9/26/19 2.1b HW 39

9/27/19 Recipe Project 2.2 and 2.3 Notes: Dividing Fractions 40

10/1/19 Grudgeball 41

10/1/19 Ch 2 HW 42

10/3/19 2.4 Notes: Adding and Subtracting Decimals 43

10/3/19 2.4 HW 44

2.4 Notes: Adding and Subtracting Decimals

43

10/3/19

Consider the following scenario…

Ms. Ross went to Jersey Mike’s to buy lunch for Mr. Kroon, Ms. Steinbach, Mr. Rieder and herself.


Ms. Ross went to Jersey Mike’s to buy lunch for Mr. Kroon, Ms. Steinbach, Mr. Rieder and herself. She buys 4 sandwiches, 4 bags of chips, and 1 drink.


Ms. Ross went to Jersey Mike’s to buy lunch for Mr. Kroon, Ms. Steinbach, Mr. Rieder and herself. She buys 4 sandwiches, 4 bags of chips, and 1 drink. She got 2 regular 7 sandwiches for $8.85 each, 1 regular 6 sandwich for $8.95, and 1 regular 26 sandwich for $8.95.


Ms. Ross went to Jersey Mike’s to buy lunch for Mr. Kroon, Ms. Steinbach, Mr. Rieder and herself. She buys 4 sandwiches, 4 bags of chips, and 1 drink. She got 2 regular 7 sandwiches for $8.85 each, 1 regular 6 sandwich for $8.95, and 1 regular 26 sandwich for $8.95. How much did the sandwiches cost altogether?



8.85 + 8.85 + 8.95 + 8.95



8.85 + 8.85 + 8.95 + 8.95

8.85

8.85

8.95

+ 8.95



8.85 + 8.85 + 8.95 + 8.95

8.85

8.85

8.95

+ 8.95

35.60



8.85 + 8.85 + 8.95 + 8.95

8.85

8.85

8.95

+ 8.95

35.60

The sandwiches cost $35.60 altogether.

Ms. Ross went to Jersey Mike’s to buy lunch for Mr. Kroon, Ms. Steinbach, Mr. Rieder and herself. She buys 4 sandwiches, 4 bags of chips, and 1 drink. She got 2 regular 7 sandwiches for $8.85 each, 1 regular 6 sandwich for $8.95, and 1 regular 26 sandwich for $8.95. (a) How much did the sandwiches cost altogether? (b) She bought 3 bags of chips separately, which cost $1.45 each. How much did all three bags cost together? (use addition to find your answer)


1.45 + 1.45 + 1.45


1.45 + 1.45 + 1.45

1.451.45

+ 1.454.35


1.45 + 1.45 + 1.45

1.451.45

+ 1.454.35

Three bags of chips cost $4.35 altogether.

Ms. Ross went to Jersey Mike’s to buy lunch for Mr. Kroon, Ms. Steinbach, Mr. Rieder and herself. She buys 4 sandwiches, 4 bags of chips, and 1 drink. She got 2 regular 7 sandwiches for $8.85 each, 1 regular 6 sandwich for $8.95, and 1 regular 26 sandwich for $8.95. (a) How much did the sandwiches cost altogether? (b) She bought 3 bags of chips separately, which cost $1.45 each. How much did all three bags cost together? (use addition to find your answer) (c) A drink and chip combo cost $3.15. If the chips cost the same as they did in part b, how much did the drink cost?


3.15 − 1.45


3.15 − 1.45

3.15

-1.45

1.70


3.15 − 1.45

3.15

-1.45

1.70

The drink costs $1.70.

On Your Own


Determine how much each teacher owes Ms. Ross based on what they ordered:

• Mr. Kroon ordered a regular #6

• Mrs. Steinbach ordered a regular #26 and a bag of chips.

• Mr. Rieder ordered a regular #7, a bag of chips, and a drink.

On Your Own

Determine how much each teacher owes Ms. Ross based on what they ordered:

• Mr. Kroon ordered a regular #6

• Mrs. Steinbach ordered a regular #26 and a bag of chips.

• Mr. Rieder ordered a regular #7, a bag of chips, and a drink.

Kroon: 8.95

Steinbach: 8.95 + 1.45

Rieder: 8.85 + 1.70 + 1.45

Mr. Kroon owes Ms. Ross $8.95, Ms. Steinbach owes Ms. Ross $10.40, and Mr. Rieder owes Ms. Ross $12.00.

Ms. Ross went to Jersey Mike’s to buy lunch for Mr. Kroon, Ms. Steinbach, Mr. Rieder and herself. She buys 4 sandwiches, 4 bags of chips, and 1 drink. She got 2 regular 7 sandwiches for $8.85 each, 1 regular 6 sandwich for $8.95, and 1 regular 26 sandwich for $8.95. (a) How much did the sandwiches cost altogether? (b) She bought 3 bags of chips separately, which cost $1.45 each. How much did all three bags cost together? (use addition to find your answer) (c) A drink and chip combo cost $3.15. If the chips cost the same as they did in part b, how much did the drink cost? (d) Determine how much each teacher owes Ms. Ross based on what they ordered. (e) How much money did Ms. Ross spend on her own food?

Ms. Ross went to Jersey Mike’s to buy lunch for Mr. Kroon, Ms. Steinbach, Mr. Riederand herself. She buys 4 sandwiches, 4 bags of chips, and 1 drink. She got 2 regular 7 sandwiches for $8.85 each, 1 regular 6 sandwich for $8.95, and 1 regular 26 sandwich for $8.95. (a) How much did the sandwiches cost altogether? (b) She bought 3 bags of chips separately, which cost $1.45 each. How much did all three bags cost together? (use addition to find your answer) (c) A drink and chip combo cost $3.15. If the chips cost the same as they did in part b, how much did the drink cost? (d) Determine how much each teacher owes Ms. Ross based on what they ordered. (e) How much money did Ms. Ross spend on her own food?

Regular 7 + 2 chips

8.85 + 1.45 + 1.45

11.75

Ms. Ross spent $11.75 on her own food.

Quick Practice

1. 8.13 + 2.76

2. 5.−3.174

3. 27 − 18.905

Estimate:

Quick Practice

1. 8.13 + 2.76

2. 5.5 − 3.174

3. 27 − 18.905

Estimate:

10

Quick Practice

1. 8.13 + 2.76

2. 5.5 − 3.174

3. 27 − 18.905

Estimate:

10

2

Quick Practice

1. 8.13 + 2.76

2. 5.5 − 3.174

3. 27 − 18.905

Estimate:

10

2

9

Quick Practice

1. 8.13 + 2.76

2. 5.5 − 3.174

3. 27 − 18.905

Estimate:

10

2

9

Find the exact sum or difference on your own.

Quick Practice

1. 8.13 + 2.76

10.89

2. 5.5 − 3.174

3. 27 − 18.905

Estimate:

10

2

9


8.13

+2.76

10.89

Quick Practice

1. 8.13 + 2.76

10.89

2. 5.5 − 3.174

2.326

3. 27 − 18.905

Estimate:

10

2

9


8.13

+2.76

10.89

5.500

-3.174

2.326

Quick Practice

1. 8.13 + 2.76

10.89

2. 5.5 − 3.174

2.326

3. 27 − 18.905

8.095

Estimate:

10

2

9


8.13

+2.76

10.89

5.500

-3.174

2.326

27.000

-18.905

8.095

• When adding or subtracting decimals,

• When adding or subtracting decimals, line up the decimal point.


• If you use a whole number,


• If you use a whole number, the decimal point hides at the end.



• If the numbers have a different amount of digits,



• If the numbers have a different amount of digits, put zeros in the blank spots.

Example: an electric bill

• According to Southern California Edison (an electric company), Ms. Ross’s last three electric bills are shown below.


• According to Southern California Edison (an electric company), Ms. Ross’s last three electric bills are shown below. Excluding late fees, how much money does Ms. Ross owe SCE? (show work)



October: $32.51

September: $21.39

August: $19



October: $32.51

September: $21.39

August: $19

Ms. Ross owes SCE $72.90.

32.5121.39

+19.0072.90

Example: utilities

Every month, Akonam pays for two utilities in her apartment: gas and electricity.

Example: utilities

Every month, Akonam pays for two utilities in her apartment: gas and electricity. She budgets $60 every month for utilities.

Example: utilities

Every month, Akonam pays for two utilities in her apartment: gas and electricity. She budgets $60 every month for utilities. Her gas bill in April ended up being twenty-nine dollars and twenty-four cents. Her electric bill ended up being fifteen dollars and eight cents.

Example: utilities

Every month, Akonam pays for two utilities in her apartment: gas and electricity. She budgets $60 every month for utilities. Her gas bill in April ended up being twenty-nine dollars and twenty-four cents. Her electric bill ended up being fifteen dollars and eight cents. After paying her bills, how much money does she have left in her utility budget (a surplus).

Example: utilities

Every month, Akonam pays for two utilities in her apartment: gas and electricity. She budgets $60 every month for utilities. Her gas bill in April ended up being twenty-nine dollars and twenty-four cents. Her electric bill ended up being fifteen dollars and eight cents. After paying her bills, how much money did she have left in her utility budget (a surplus).

Try it on your own.

Example: utilities

Every month, Akonam pays for two utilities in her apartment: gas and electricity. She budgets $60 every month for utilities. Her gas bill in April ended up being twenty-nine dollars and twenty-four cents. Her electric bill ended up being fifteen dollars and eight cents. After paying her bills, how much money did she have left in her utility budget (a surplus).

29.24

+15.08

44.32

60.00-44.3215.68 She had a surplus of $15.68 in her

utility budget.

Example: Using Cash

Nhat takes his cat (Goose) to the vet. The invoice includes the charges shown below. If Nhat ends up paying cash, what bills and coins does he need to pay the entire bill?

1 Bravecto CAT (flea medicine) $65.92

1 Examination/Consultation $63

1 FVRCP (vaccination) $14.59

30 Chlorpheniramine 4 mg tabs (allergy medicine) $17

Example: Using Cash

Nhat takes his cat (Goose) to the vet. The invoice includes the charges shown below. If Nhat ends up paying cash, what bills and coins does he need to pay the entire bill?





$159.51

Example: CashNhat takes his cat (Goose) to the vet. The invoice includes the charges shown below. If Nhat ends up paying cash, what bills and coins does he need to pay the entire bill?





$159.51

Nhat could use a hundred dollar bill, a fifty, nine ones, two quarters, and one penny.

Quick Examples

Wrap Up Questions (for lining up)

1. What must you do whenever you add or subtract decimals?

2. In word problems, what words would indicate that you should add?

3. In word problems, what words would indicate that you should subtract?

4. What must you do whenever you divide mixed numbers?

5. What must you do whenever you multiply mixed numbers?

6. What can you never do when multiplying two mixed numbers together?

7. When multiplying fractions, how can you make the numbers smaller?

8. How do you multiply fractions?

9. When writing your final answer as a fraction, what must you always do, whether the directions say so are not?

10. What do you need whenever you solve a word problem?

thursday, october 3, 2019 · 10/3/2019 · 9/26/19 2.1b hw 39 9/27/19 recipe project 2.2 and 2.3...

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