Mr. Ohashi's Math 8 Website

Eighth Grade Math at Eckstein Middle School

Online Math Resources

To find helpful webpages, you can either scroll down or select one of the topics below:

1st Semester Units
Algebra
Linear Relationships
Functions
Systems of Equations

2nd Semester Units
Bivariate Data
Exponents
Square Roots & the Pythagorean Theorem
Transformations
Geometry


General Information

Need a good reference book for use at home?
I would highly recommend the book Algebra To Go. It covers nearly all of the math that we will do, is kid friendly, makes good math refreshers for parents, and would be a great resource for tutors! I bought my used for a pretty good price!


Algebra to Go on Amazon.com

How to do a Quiz Revision
A Quiz Revision can help bring up your grade and increase your understanding. Here are the steps to doing a Quiz Revision.

A Math Dictionary for Kids
Amazing online math dictionary that not only helps kids understand math vocabulary, but also has interactive games for each concept!

Algebra

Order of Operations

Funbrain.com’s Operations Order
A game using the order of operations.

Math.com’s Evaluating Expressions
A lesson on how to evaluate expressions by substituting values for variables.

Algebra.Help’s Substitution
A lesson on how to evaluate expressions by substituting values for variables.

Integer Computation

Math.com’s Adding & Subtracting Integers
A quick lesson on adding and subtracting positive and negative numbers. It goes step by step, with examples.

Math.com’s Multiplying & Dividing Integers
A quick lesson on multiplying and dividing positive and negative numbers. It goes step by step, with examples.

Mathgoodies’ Lessons on Integers
A variety of links to lessons working with integers

Solving Equations

Mr. Ohashi’s Algebra Tutorial
A tutorial I designed on how to solve equations and work with inequalities the way we do in class!

Khan Academy’s Algebra Videos
A list of videos that explain how to solve various types of algebra equations!

Algebra.Help’s Basics of Algebra
A lesson on how to solve algebra equations. It goes step by step, with examples.

Math.com’s Solving Two-Step Equations
A lesson on how to solve two-step algebra equations. It goes step by step, with examples.

Algebra.Help’s Combining Like Terms
A lesson on how to simplify algebra equations by combining like terms. It goes step by step, with examples.

Math.com’s Combining Like Terms
A lesson on how to simplify algebra equations by combining like terms. It goes step by step, with examples.

Math Warehouse’s Distributive Property
A lesson on how to use the distributive property to simplify an expression.

Algebra.Help’s Simplifying Calculator
Type in an algebra expression, and the calculator will walk you through simplifying it!

Linear Relationships

Proportional Relationships

Khan Academy’s Proportional Relationships Videos
A list of videos that explain how to work with proportional relationships.

Tutor Circle’s lesson on Directly Proportional Relationships
Explains proportional relationships in the forms of equations, tables, and graphs.

Linear Relationships

Mr. Ohashi’s Linear Equations Tutorial
A tutorial I designed on working with linear equations, the way we do it in class!

Khan Academy’s Linear Relationships Videos
A list of videos that explain how to work with linear relationships.

Regents Exam Prep’s Slope and Rates of Change
A lesson that explains slope.

Regents Exam Prep’s Equations of Straight Lines
A lesson on how to graph linear equations.

Math.com’s Slope and Y-intercept
A lesson that explains what slope and the y-intercept are.

Math.com’s Linear Equations
A lesson on how to graph linear equations.

Algebra.com’s Practice Linear Equations
Need more practice graphing equations? This site will give you an equation to graph and will then give you the solution to check your work!

Algebra.Help’s Function Graphing Calculator
Works like a graphing calculator. You type in the equation, the program graphs it.

Functions

Khan Academy’s Function Videos
A list of videos that explain what a function is.

Khan Academy’s Recognizing Functions Videos
A list of videos that explain how to determine if a relation is a function.

Math Is Fun’s What is a Function
An introduction to what a function is.

Purple Math’s Functions versus Relations
A lesson on what a function is, how it differs from a relationship, and how to identify a function.

Systems of Equations

Khan Academy’s Solving Systems of Equations by Graphing
A lesson on how to solve a system of equations by graphing.

Purplemath’s Systems of Linear Equations by Graphing
Help on solving a system of linear equations by graphing.

Khan Academy’s Solving Systems of Equations by Substitution
A lesson on how to solve a system of equations by substitution.

Purple Math’s Solving Systems of Equations by Substitution
A lesson on how to solve a system of equations by substitution.

Khan Academy’s Solving Systems of Equations by Elimination
A lesson on how to solve a system of equations by elimination.

Cool Math’s Systems of Equations by Elimination
A lesson on solving systems of equations by elimination.

Purple Math’s Systems of Equations by Elimination
A lesson on solving systems of equations by elimination.

Bivariate Data

Misc. Data Displays

National Library of Virtual Manipulatives – Histograms & Box-and-Whisker Plots
A Java applet that lets you plug in data to see what the display would look like!

About.com’s Stem-and-Leaf Plots
Explains what stem-and-Leaf plots are, how to read them, and how to make them. It’s a little confusing because they have the stem-and-leaf plots in tables.

Regents Exam Prep’s Prep Box-and-Whisker Plots
A really good lesson on how to make a box-and-whisker plot

Basic Mathematics on Circle Graphs
A page on how to read circle graphs and step-by-step directions on making one by hand

Scatter Plots

Khan Academy’s Scatter Plot Videos
A list of various videos that explain how to work with scatter plots.

Regent’s Prep: Line of Best Fit
A page that explains what a line of best fit is and how to use a graphing calculator to find it.

Line of Best Fit Applet
This is an interactive applet that lets you plot several points and guess where the line of best fit goes.

Two-Way Tables

Khan Academy’s Two-Way Tables Videos
A list of various videos that explain how to work with two-way tables and two-way relative frequency tables.

Study.com’s Two-Way Table
A video that explains what a two-way table is and how to read it.

Exponents

Exponent Rules

Khan Academy’s Exponents Videos
A list of various videos that explain how to work with exponents.

Khan Academy’s Negative Exponents Videos
A list of various videos that explain how to work with negative exponents.

Math Goodies – Exponents
An introduction to exponents.

Purplemath’s Basic Information on Exponents
This page explains the rules for working with exponents.

Math.com’s Exponents In Depth
This page also explains the rules for working with exponents.

Cool Math’s Exponent Rules
Cool Math’s page on exponent rules. There are tutorials for each rule, and a summary of them all!

Scientific Notation

Khan Academy’s Powers of 10 Videos
A list of various videos that explain how to compute with powers of ten.

Khan Academy’s Scientific Notation Videos
A list of various videos that explain scientific notation.

Khan Academy’s Computing with Scientific Notation Videos
A list of various videos that explain how to compute with scientific notation.

Khan Academy’s Scientific Notation Story Problems Videos
A list of various videos that explain how to solve story problems involving scientific notation.

Purple Math’s Scientific Notation
A tutorial on working with scientific notation.

Regents Prep – Scientific Notation
Lessons on converting to and from scientific notations, and computing with scientific notation.

Science Help Online Chemistry
More lessons on converting to and from scientific notations, and computing with scientific notation.

Square Roots & the Pythagorean Theorem

Repeating Decimals and Fractions

Khan Academy’s Repeating Decimals Videos
A list of videos that explain how to write fractions for repeating decimals.

Hot Math’s Converting Decimals to Fractions
Shows how to convert a repeating decimal into a fraction.

Square Roots & Cube Roots

Khan Academy’s Square Roots and Cube Roots
A list of videos that explain how to work with square roots and cube roots.

Math.com’s Square Roots
A lesson on what square roots are and how to calculate them.

The Math Page – Simplifying Radicals
Gives a lesson and some practice on simplifying square roots.

Rational & Irrational Numbers

Khan Academy’s Irrational Numbers
A list of videos that explain irrational numbers.

Khan Academy’s Approximating Irrational Numbers
A list of videos that explain how to approximate the value of and compare irrational numbers.

Fact Monster’s Rational and Irrational Numbers
Good explanation on what rational and irrational numbers are!

Math Is Fun Rational and Irrational Numbers
Another good explanation on what rational and irrational numbers are!

Working on a Coordinate Grid

Regents Exam Prep’s Areas on a Coordinate Grid
A lesson on finding the areas of shapes on a coordinate grid.

The Pythagorean Theorem

Khan Academy’s Pythagorean Theorem
A list of videos that explain how to work with the Pythagorean Theorem.

Khan Academy’s Proofs of the Pythagorean Theorem
A list of videos that explain proofs of the Pythagorean Theorem.

Math.com’s Pythagorean Theorem Tutorial
A lesson on the Pythagorean Theorem and how to use it.

About.com’s Pythagorean Theorem Tutorial
Another lesson on the Pythagorean Theorem and how to use it.

Online Math Learning on 45-45-90 Triangles
Some information on the special properties of 45-45-90 triangles.

Regents Prep on 45-45-90 Triangles
Some information on the special properties of 45-45-90 triangles.

Online Math Learning on 30-60-90 Triangles
Some information on the special properties of 30-60-90 triangles.

The Math Page on 30-60-90 Triangles
More information on the special properties of 30-60-90 triangles.

Regents Prep on 30-60-90 Triangles
Some information on the special properties of 30-60-90 triangles.

Volume and Surface Area

Mr. Ohashi’s Surface Area and Volume Tutorial
A tutorial I designed on finding the surface area and volume, the way we do it in class!

Khan Academy’s Volume
A list of videos the explain how to find the volume of various solids

Math.com’s Area Formulas
Formulas for areas of shapes.

Regents Exam Prep’s Area of Polygons
A good reference for the area formulas for different shapes

Math.com’s Prism Tutorial
A lesson on what a prism is and how to find volumes of prisms.

Math.com’s Pyramid Tutorial
A lesson on what a pyramid is and how to find volumes of pyramids.

Math.com’s Cylinders, Cones, and Spheres Tutorial
A lesson on what these objects are and how to find their volumes.

Symmetry and Transformations

Symmetry

The Math Forum: Types of Symmetry
A website that describes the different types of symmetry.

TeachNet – Line Symmetry
This page describes and has examples of line symmetry (reflective symmetry).

AnalyzeMath.com: Rotation Symmetry
This webpage talks about rotational symmetry, and also has an interactive java applet!

TeachNet – Rotational Symmetry
This page describes and has examples of rotational symmetry.

Transformations

Khan Academy’s Reflections
A list of videos on working with reflections.

Khan Academy’s Rotations
A list of videos on working with rotations.

Khan Academy’s Translations
A list of videos on working with translations.

Khan Academy’s Dilations
A list of videos on working with dilations.

Math Warehouse – Translations in Math
Describes the basic translations that we will be working with. If you scroll down, each has a link to an individual tutorial!

Regent’s Prep – Reflections in a Line
This page shows how to perform a reflection (flip) across a line.

Regent’s Prep – Rotations
This page shows how to perform a rotation (turn).

Regent’s Prep – Translations
This page shows how to perform a translation (slide).

Regent’s Prep – Dilations
This page shows how to perform a dilation.

AnalyzeMath.com: Reflection Across a Line
This webpage talks about how to reflect objects across a line. There is even an interactive java applet so you can see it!

Geometry

Khan Academy’s Angles Between Parallel Lines
A list of videos on finding the measures of angles from parallel lines and a transversal.

Khan Academy’s Angles in a Triangle
A list of videos on finding the measures of angles in a triangle.

Math League: Angles and Angle Terms
A page that explains what angles are and identifies various types of angles.

Regents Prep – Angles with Parallel Lines
This page explains the different angles formed when parallel lines are intersected by a transversal.

Tutorvista – Intro to Transversal Lines
An explanation of the angles formed when a transversal intersects parallel lines.

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