8th Math STAAR Review

1. 8th Grade Math STAAR Review

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Area of Squares

• When given area of a square take the square root ​of the area to find the side length.

• Ex) area of a square is 25. √​25 =5. The side length is 5.

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Direct variation

​Key Words : Varies Directly

Set up a proportion and cross multiply to solve for missing value​

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Pythagorean Theorem

a²+b²=c²

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Key words: Distance, Diagonal, Right traiangle, Hypotenuse​.

• if looking for diagonal/hypotenuse add.

• if ​looking for a side that makes up the right angle/leg subtract.

• To find distance between 2 points on a graph take the rise²+the run² and take the square root of your answer.

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Writing Equations from Graphs

Y=mx+b

m=slope

b=y-intercept​

• to find slope find the rise over the run between 2 points

• to find y-intercept find where the line hits the y-axis​

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​Ordering/Comparing Numbers

• change all numbers to decimals

• The big​gest negative is the least

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• 2.25

• 2

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Volume of spheres

4/3 π r³

• If given diameter divide by 2 to get radius

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Surface Area of Prisms

Lateral: Ph

Total: Ph+2B​

P-perimeter of base

h-height of prism (distance between the 2 bases)

B- Area of the base​

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Multiple Choice

• 87.6

• 237.5

• 45.6

• 217.8

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System of equations​

Find the ordered pair where the two lines meet (intersection)

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