MATH STAAR

8TH GRADE

REVIEW

PLEASE REMEMBER!!

•You must TRY each problem!

•Underline important statements!

•Bubble as you go•DO YOUR BEST!!!

Order of Operations

P E M D A S

PLEASE EXCUSE MY DEAR AUNT SALLY

Parenthesis, Exponents, Multiply or Divide, Add or Subtract

Formula ChartTear it out! WRITE on it! USE IT!

Perimeter

Area

Volume

Surface Area

Metric Measurement

Customary

Measurement

Remember

SQUARE ROOT

Find what number can be multiplied by itself

AREA is squared

To the 2nd power

n x n

VOLUME is cubed

to the 3rd power

n x n x n

Dimensions• Perimeter and Circumference are 1 dimension

• Area is 2 dimensions

• Volume is 3 dimensions

• Scale factor that effects dimensions is multiplied to EACH dimension!

• New Perimeter is SF

• New Ares SF2

• New Volume SF3

PYTHAGOREAN THEOREM FORMULA (Right Triangle)

a and b are sides that form right anglec is the hypotenuse

TOTAL DEGREES OF A CIRCLEis 360 degrees

SUM OF THE INTERIOR ANGLES of a triangle is 180 degrees

C

360

180

a²+ b² = c²

ADD & SUBTRACT FRACTIONS

Write the problems verticallyFind a common denominator

Add numerators only

Reduce answers to lowest terms3 = 94 =122 = 83 =12 17 = 5 12 12

1

+

MULTIPLY FRACTIONSWrite horizontally

Numerator x Numerator Denominator x Denominator

Reduce to lowest terms

4 x 6 = 24 = 3 5 x 8 = 40 = 5

DIVIDE FRACTIONSWrite

horizontallyRemember there is no division

Find the reciprocal (flip it) of the 2nd fraction and multiply (KCF – Keep Change Flip)

Reduce to lowest terms

7 . 15 9 ‘ 12

7 x 12 = 54 = 39 x 15 = 135 = 5

When to Use Proportions

If in doubt, try proportions

Comparing two things • (miles/gallons)• ($ to feet)• (meters per second)

Rates/Unit RatesSimilar FiguresConverting Units of MeasurePercents %Probability Predictions

Percent:

Out of 100

% of 100

To solve any percent or comparison problem:

write as a proportion.

Part = %Whole 100

orIs = %Of 100

Percent of a Number

DISCOUNT = Rate(%) X Original price

FINAL COST = Original price - DISCOUNT

SALES TAX=Rate(%) x Price

TOTAL COST= Price + SALES TAX

FRACTION TO DECIMAL

Divide the denominator into the numerator

34 4 3.00

.75

TOP DOG in the HOUSE!

PERCENT TO A FRACTION

Place the percent over 100

Reduce to Lowest terms

42% = 42 = 21 100 50

CHANGE DECIMAL TO A PERCENT

Move the decimal 2 places to the right and add a % sign

(Dr. Pepper – DP)(Decimal to Percent)

.35 = 35%

.354 = 35.4%

MEAN

Your ‘mean’ teacher will average your grades.*Don’t use with an outlier

MEDIAN

The ‘middle’ number in an ordered list of numbers.*Use Median when you have an outlier

MODEThe number that appears the ‘most’.

Least to

Greatest!

INTEGER RULES

Adding Integers

Positive + Positive = Positive

Negative + Negative = Negative

Positive + Negative or

Negative + PositiveYou subtract and take the sign of the larger number.

4 + 5 = 9

-4 + -5 = -9

4 + -5 = -1

5 + -4 = 1

Subtracting Integers

Remember – Identify the sign of each number

Then you need to followthe addition rules for integers.

*remember two negatives swooshTo make a positive

-5 - (-7) -5 + 7 =

2

MULTIPLY & DIVIDING INTEGERS

Product/Quotient of like signs is positivePositive x Positive = Positive

Positive / Positive = Positive5 x 6 = 3030 6 = 5

Negative x Negative = Positive

Negative / Negative = Positive

-4 x -7 = 28

-28 -7 = 4 Product/Quotient of unlike signs is negative

Positive x Negative = NegativeNegative / Positive = Negative

6x-7 = -42

-42 7 = -6

REMEMBER THESE WORDS!

VERTICAL

HORIZONTAL

GOES UP

GOES DOWN

< less than

> greater than

Increase

Decrease

Here’s

THE PLAN

to help you

pass the

MATH STAAR!!

Concentrate on the problems you know how to solve first.

Key words are useful.

Leave the harder problems for last.Do not become frustrated.

Eliminate extra information!

Use process of elimination to help narrow your answer

choices. Choose the answer that is better than the others.

After working each problem circle the answer you have selected in your test booklet and BUBBLE

YOUR SCANTRON

When you are finished working allthe problems, double check your work.

Make sure you circled an answer in your test booklet and MARKED YOUR ANSWER SHEET.

Rework any problems you had concerns about.

•Last But Not Least --

***Mark your scantron very carefully!!!!***

• Make sure each test question has been marked on your answer document

•Try not to make any mistakes in marking

your scantron. If you have to erase be

sure to erase the mark completely.

YOU CAN DO THIS!

•You have worked diligently for this day!

•Take a deep breathe,•Relax,•PASS THE STAAR!