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# 6 th Grade Review - PowerPoint PPT Presentation

6 th Grade Review. Racing Review. Race!. Whole Number Operations. Addition. 1 . 4137 + 739. 2 . 567 +139. 3 . 5602 +8835. 4 . 65391 + 87. 5 . 941372 + 128343. Solutions:. 4,876 706 14,437 65,478 1,069,715. Whole Number Operations. Subtraction. Right or Wrong?.

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Whole Number Operations

1. 4137

+ 739

2. 567

+139

3. 5602

+8835

4. 65391

+ 87

5. 941372

+ 128343

• 4,876

• 706

• 14,437

• 65,478

• 1,069,715

Subtraction

Right or Wrong?

Can you find the mistake?

• 345

• - 278

• 57

2. 9864

- 671

9193

3. 149856

- 51743

97113

• 4. 7548362

• 969457

• 6678905

Multiplication

Learning Partners

• Create 3 multiplication problems (do not use more than 3 digits)

• Switch with a neighbor

Division

RACE!

• 9954 ÷ 63

• 87 ÷ 3

• 48026 ÷ 37

• 73080 ÷ 20

• 850 ÷ 5

6. 210 ÷ 7

7. 54 ÷ 6

8. 2571 ÷ 3

9. 2992 ÷ 4

10. 63 ÷ 9

1. 1582. 293. 12984. 36545. 1706. 307. 98. 8579. 74810. 7

Solutions

### EQ: How do I solve numerical expressions?

• Draw a real world example of an event that must be done in a certain order

Order is

important!

Term

EXAMPLE

Expression – a collection of numbers and operations

11 – 14 ÷ 2 + 6

E - exponents

M - multiply

D - divide

S - subtract

Vocabulary

PEMDAS

EXAMPLE

11 – 14 ÷ 2 + 6

Order of Operations

– the rules we follow when simplifying a numerical expression

Which student evaluated the arithmetic expression correctly?

Susie!

Example 1

Simplify the expression.

3 + 15 ÷ 5

Divide.

3 + 15 ÷ 5

3 + 3

6

Example 2

Simplify the expression.

44 – 14 ÷ 2 · 4 + 6

44 –14 ÷ 2 · 4 + 6

Divide and multiply from

left to right.

44 –7 · 4 + 6

44 – 28 + 6

left to right.

16 + 6

22

Example 3

Simplify the expression.

3 + 23 · 5

Evaluate the power.

3 + 23 · 5

Multiply.

3 + 8 · 5

3 + 40

43

Example 4

Simplify the expression.

28 – 21 ÷ 3 · 4 + 5

28 –21 ÷ 3 · 4 + 5

Divide and multiply from

left to right.

28 –7 · 4 + 5

left to right.

28 – 28 + 5

0 + 5

5

When an expression has a set of grouping symbols within a second set of grouping symbols, begin with the innermost set.

Grouping Symbols

[ ]

( )

{ }

Example 5

Simplify the expression.

42 – (3 · 4) ÷ 6

Perform the operation inside the parentheses.

42 –(3 · 4) ÷ 6

42 –12 ÷ 6

Divide.

42 – 2

Subtract.

40

Example 6

Simplify the expression.

A. 24 – (4 · 5) ÷ 4

Perform the operation inside the parentheses.

24 – (4 · 5) ÷ 4

24 –20 ÷ 4

Divide.

24 – 5

Subtract.

19

Example 7

Simplify the expression.

[(26 – 4 · 5) + 6]2

The parentheses are

inside the brackets, so

perform the operations

inside the parentheses

first.

[(26 –4 · 5) + 6]2

[(26 –20) + 6]2

[6 + 6]2

122

144

Example 8

Simplify the expression.

[(32 – 4 · 4) + 2]2

The parentheses are

inside the brackets, so

perform the operations

inside the parentheses

first.

[(32 –4 · 4) + 2]2

[(32 –16) + 2]2

[16 + 2]2

182

324

Example 9

3 + 6 x (5+4) ÷ 3 - 7

Step 1: Parentheses

3 + 6 x (5+4) ÷ 3 – 7

Step 2: Multiply and Divide in order from left to right

3 + 6 x9 ÷ 3 – 7

3 + 54÷ 3 – 7

Step 3: Add and Subtract in order from left to right

3 + 18 - 7

Solution: 14

Example 10

150 ÷ (6 +3 x 8) - 5

Step 1: Parentheses

150 ÷ (6 +3 x 8) – 5

Step 2: Division

150 ÷30 – 5

Step 3: Subtraction

5– 5

Solution: 0

Classify each statement as true or false. If the statement is false, insert parentheses to make it true.

(

)

false

1. 4  5 + 6 = 44

2. 24 – 4  2 = 40

(

)

false

true

3. 25÷ 5 + 6  3 = 23

4. 14 – 22 ÷ 2 = 12

true

Sandy runs 4 miles per day. She ran 5 days during the first week of the month. She ran only 3 days each week for the next 3 weeks. Simplify the expression (5 + 3 · 3) · 4 to find how many miles she ran last month.

Perform the operations in parentheses first.

(5 + 3 · 3) · 4

(5 + 9) · 4

Multiply.

14 · 4

56

Sandy ran 56 miles last month.

Jill is learning vocabulary words for a test. From the list, she already knew 30 words. She is learning 4 new words a day for 3 days each week. Evaluate how many words will she know at the end of seven weeks.

Perform the operations in parentheses first.

(3 · 4 · 7) + 30

(12 · 7) + 30

Multiply.

84 + 30

Jill will know 114 words at the end of 7 weeks.

114

Denzel paid a basic fee of \$35 per month plus \$2 for each phone call beyond his basic plan. Write an expression and simplify to find how much Denzel paid for a month with 8 calls beyond the basic plan.

\$51

Simplify each expression.

1. 27 + 56 ÷ 7

2. 9 · 7 – 5

3. (28 – 8) ÷ 4

4. 136 – 102 ÷ 5

5. (9 – 5)3 · (7 + 1)2 ÷ 4

35

58

5

116

1,024

EQ: How can I perform operations with fractions?

Math Dictionary

Example

Fraction Action Vocabulary

Example

1. 1/5 + 2/5

2. 7/12 + 1/12

3. 3/26 + 5/26

With Like Denominators!

With Different Denominators!

1. 2/3 + 1/5

2. 1/15 + 4/21

3. 2/9 + 3/12

• Steps:

• Find the LCD

• Rename the fractions to have the same LCD

• Simplify the fraction

1. 3/5 - 2/5

2. 7/10 – 2/10

3. 21/24 – 15/24

With Like Denominators!

With Different Denominators!

1. 2/3 – 4/12

2. 4/6 – 1/15

3. 2/12 – 1/8

• Steps:

• Find the LCD

• Rename the fractions to have the same LCD

• Subtract the numerators

• Simplify the fraction

1. 2/9 x 3/12

2. ½ x 4/8

3. 1/6 x 5/8

• Steps:

• Multiply the numerators

• Multiply the denominators

• Simplify the fraction

• Steps:

• Keep it, change it, flip it!

• Multiply the numerators

• Multiply the denominators

• Simplify the fraction

1. 2/10 ÷ 2/12

2. 1/8 ÷ 2/10

3. 1/6 ÷ 3/15

Keep it, Change it, Flip it!

More with fractions

Math Dictionary

Example

• Steps:

• Divide

• Remember…First come, first serve

1. 55/9

2. 39/4

3. 77/12

Divide!

• Steps:

• Multiply the whole number by the denominator

• Add the result to the numerator (that will be your new numerator)

• The denominator stays the same

1.

2.

3.

Check Mark Method

1.

2.

• Steps:

• Convert both mixed numbers to an improper fraction

• Follow the necessary steps for the given operation

• Simplify

True or False?

• 3/8 = 375/1000

• 18/54 = 23/69

• 6/10 = 6000/1000

• True

• True

• False

Homework: handout

EQ: How do I perform operations with decimals?

Math Dictionary

• A way to represent fractions

• EX:

• Look at the last decimal place…that place value is the denominator of the fraction

• 2. The numbers to the right of the decimal are the numerator

Math Dictionary

• The value of a digit based on its position in a number

FunBrain - Place Value Puzzler

• Order from least to greatest

3.84, 4.4, 4.83, 3.48, 4.38

5.71, 5.8, 5.68, 5.79, 5.6

1. 6.5 ____ 6.45

• 12.4312 _____ 12.43112

• .6 ____.61

• Round to the nearest one

17.6

• Nearest thousandth

12.5503

• Nearest hundredth

2.2959

Add or Subtract, line it up, line it up!

Add or Subtract, line it up, line it up!

Multiply, Count it out, count it out!

Multiply, Count it out, count it out!

Division, step it out!

Division, step it out!

• Just make sure to line up the decimal points so that all the decimal points are on a vertical line

Draw a line through the points!

HINT:

156.7 + 23.14 =

57.123 – 14.25 =

• Multiply the numbers like normal

• Move the decimal to the right the exact number of place values in the numbers being multiplied

45.68 x 3.5=

• Stranger Story

• The stranger moves toward the door, so you move the same amount back

• The stranger gets to the door!

• GET AWAY! Go to the ROOF!

• Then, divide like normal

16.9 ÷ 6.5

55.318 ÷ 3.4

EQ: How are percents, ratios, and proportions related?

Math Dictionary

• A ratio that compares a number to 100

• Out of 100

• Part/whole

25%

30%

95%

73%

Math Dictionary

• A comparison of two numbers

• Part

Part

What is the ratio of pink circles to white circles?

Math Dictionary

• An equation that shows two ratios are equal

Examples

Convert to a fraction and a percent…

1. .25

2. .003

Convert to a percent and decimal…

1. 3/4

2. 23/50

Convert to a fraction and a decimal…

1. 25%

2. 104%

EQ: How can I evaluate algebraic expressions?

Card activity

Math Dictionary

• An unknown quantity

x

k

z

y

m

Math Dictionary

• A collection of numbers, variables, and symbols

• NO equal sign!!

Example

10 (x+3) + 2

Math Dictionary

• To reduce to the most basic form

• Make it simple!

• 3 + 5 (3*5)

Examples

Find the variable, replace it

Simplify the expression