Mr. Ohashi's Math Homepage

MATH HELP RESOURCES

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

1st Semester Units
Symmetry & Transformations
Geometry
Thinking With Mathematical Models
Looking For Pythagoras
Exponents

2nd Semester Units
Say It With Symbols
Probability
Samples and Populations
The Shapes of Algebra
Frogs, Fleas, and Painted Cubes

Resources for Common Difficulties
Story Problems
Fractions
Integer Computation
Proportions
Volume & Surface Area
Number Sense

General Information

Need a good reference book for use at home?
I would highly recommend the following two books for keeping at home. They cover nearly all of the math that we will do (especially Algebra To Go), are kid friendly, make good math refreshers for parents, and would be a great resource for tutors! I found mine used online for about $10!

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!

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: 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!

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

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

Transformations

Regent's Prep - Transformations
This page describes the three different types of transformations we do in class.

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!

Tessellations

Math Forum: Tessellation
A page that talks about what tessellations are and how they work.

Triangle Tessellations
This is an animated tutorial on how to make a triangle into a tessellation.

Quadrilateral Tessellations
This is an animated tutorial on how to make a quadrilateral into a tessellation.

The Official M.C. Escher Website
This is the website for M.C. Escher, the artist who made tessellations famous!

Escher Tile Gallery
Some great examples of Escher's work. These are tiles that can be placed next to one another to repeat forever!

Geometry

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

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

Thinking With Mathematical Models (Algebra & Linear Equations)

Algebra

Mr. Ohashi's Order of Operations Page
A tutorial I designed on how to use the order of operations, the way we do it in class!

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.

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

Mr. Ohashi's Solving Problems with Equations Page
A tutorial I designed on how to write algebra equations to solve story problems, the way we do it in class!

Algebra.Help's Solving Equations
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.

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

Linear Equations

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

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.

Looking For Pythagoras (Square Roots & the Pythagorean Theorem)

Square 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

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

Mr. Ohashi's Drawing Squares on a Grid
A tutorial I designed on drawing squares on a grid. For use with Problem 1.3 of Looking For Pythagoras.

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

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.

Trigonometry

Math.com's Labeling Sides Tutorial
A lesson on identifying the hypotenuse, opposite side, and adjacent side on a right triangle.

The Math Lab's Trigonometric Ratios Table
This table has all of the trigonometric ratios for all possible angles in a right triangle.

Exponents

Exponent Rules

Math Goodies - Exponents
An introduction to exponents

Purplemath's Basic Information on Exponent
An introduction to exponents and some properties about them

Math.com's Exponents In Depth
This page 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!

Exponential Functions

Purplemath's Graphing Exponential Functions
An introduction to exponential functions and help on graphing them.

Algebra.com's Exponentials
Help on graphing exponential functions.

Scientific Notation

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

Say It With Symbols

Algebra

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.

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

Probability

Basics of Probability

Probability Tutorial
A tutorial I designed on how to do the probability work, the way we do it in class!

Math Goodies' Probability
Has some lessons on the basics of probability.

MathLeague Probability Help Page
Some good explanations on some basic probability.

Math Goodies' Independent Events
Explains how to find the probability of two independent events occurring.

Probability Theory
A good explanation of the difference between "mutually exclusive events" and "independent events".

Counting Techniques

Saskatchewan Schools' Fundamental Counting Princple
This page has a good explanation of how to find the number of possible outcomes using the Counting Principle!

College Algebra Tutorial - The Fundamental Counting Princple
Although this site is meant for college students, this page shows exactly what we are doing in our class! It explains how to use the counting principle to find the number of possible outcomes.

Math Is Fun - Combinations & Permutations
A good explanation of the difference between the mathematical terms "combinations" and "permutations".

Venn Diagrams

Purple Math's Venn Diagram Word Problems
This is a great tutorial page! It explains how to solve Venn Diagram story problems in a step by step manner.

Samples and Populations (Data & Data Displays)

Measures of Center

About.com's Statistically Right!
Explains the mean, median, and mode

Data Displays

ExploreLearning's Gizmos
A variety of programs that let you input your own data and they will make data displays for you! There are many different displays to choose from: histograms, line plots, box-and-whisker plots, stem-and-leaf plots, etc. They are very visual and interactive!

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

Line of Best Fit

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.

The Shapes of Algebra (Systems of Linear Equations and Inequalities)

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!

Algebra.Help's Solving Equations
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 Equation Solving Calculator
Type in your algebra equation, and the calculator will walk you through solving it!

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.

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

Linear Equations

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

Inequalities

Mr. Ohashi's Solving Inequalities Page
A tutorial I designed on how to solve inequalities, the way we do it in class!

Mr. Ohashi's Graphing Inequalities Page
A tutorial I designed on how to graph inequalities, the way we do it in class!

Math.com's Writing Inequalities
A lesson on how to write inequalities from story problems.

Math.com's Solving Inequalities
A lesson on how to solve inequalities.

Regents Exam Prep's Solving Linear Inequalities
A lesson on how to simplify algebra equations by combining like terms. It goes step by step, with examples.

Systems of Linear Equations/Inequalities

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

Purplemath's Systems of Linear Inequalities
Help on solving a system of inequalities by graphing.

Cool Math's Systems of Equations
A tutorial on what systems of equations are and different ways of solving them.

Free Math Help's Solving Systems of Inequalities
Help on how to solve a system of inequalities.

Cool Math's systems of Inequalities
Goes through an example of how to find a solution to a system of inequalities by graphing them.

Frogs, Fleas, and Painted Cubes (Quadratic Relationships)

Algebra

Story Problems

Mr. Ohashi's Word Problem Solving Help Page
A web page I designed to help kids solve story problems, the way we do in class!

Mr. Ohashi's Solving Problems with Equations Page
A tutorial I designed on how to write algebra equations to solve story problems, the way we do it in class!

Algebra.com's Word Problem Solvers
Help on solving almost any type of word problem.

Fractions

Visual Fractions
An on-line tutorial that offers instruction and practice in identifying, renaming, and operating on fractions.

Math.com's Adding & Subtracting Fractions
A quick lesson on computing with fractions. It goes step by step, with examples.

Math.com's Multiplying Fractions
A quick lesson on computing with fractions. It goes step by step, with examples.

Math.com's Dividing Fractions
A quick lesson on computing with fractions. It goes step by step, with examples.

Math.com's Adding & Subtracting Mixed Numbers
A quick lesson on computing with mixed numbers. It goes step by step, with examples.

Math.com's Multiplying Mixed Numbers
A quick lesson on computing with mixed numbers. It goes step by step, with examples.

Math.com's Dividing Mixed Numbers
A quick lesson on computing with mixed numbers. It goes step by step, with examples.

Integer Computation

Mr. Ohashi's Integer Computation Page
A tutorial I designed on how to compute with integers, the way we do it in class!

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

Proportions

Algebra.Help's Proportions
A quick lesson on solving proportions

Math.com's Ratios and Proportions
A quick lesson on working with proportions

Amby's Math Resources
This is a tutorial on solving percent proportions exactly the same way we do it in class!

Algebra.Help's Percentage Help
Provides help solving a variety of different percentage story problems.

Algebra.Help's Proportions Calculator
Type in your proportion, and the calculator will walk you through solving it!

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!

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.

Number Sense

Infoplease Conversion Factors
Gives conversion factors for almost any measurement unit.

Mr. Ohashi's Converting Units Page
A tutorial I designed on how to convert units, the way we do it in class!