# Web2.0Calc.com

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- equations
- functions
- graphing

- prediction

###### Pros

Kids can perform all kinds of calculations without an expensive graphing calculator, and the forums are a nice addition.###### Cons

More detailed directions for kids and classroom use ideas for teachers would be helpful.###### Bottom Line

For a free tool, it's not too shabby; Web2.0Calc does everything from graphing functions to solving matrices.None

Design is very basic but also very clean, which may make it easier for kids to focus on the math. Excitement-wise, it's as fun as any calculator; it depends on what you're working on.

By eliminating some of the obstacles presented by computation, easily accessible, free online calculators like this one help kids focus on problem-solving skills. This site also gives kids a place to ask and review questions -- bonus!

Question-and-answer forums help kids with all kinds of math questions. Plus, calculators and instructions are available in five different languages.

Web2.0Calc.com can be made accessible to your students in a variety of ways. Try placing the widget on your class website, or suggest that students download the free Android app to have calculator access on their phone. Practically speaking, if students are using this tool as their only graphing calculator, you may want to think about how this will work on tests; it can be harder to manage than a traditional graphing calculator because students access it through the Web and/or their cell phone. This makes it less obvious when kids use other Web-based applications to communicate with each other during assessments. If this is a concern, consider having a class set of regular graphing calculators and encouraging kids to use this site at home for homework and practice.

Read More Read LessWeb2.0Calc.com is a free online calculator. You can choose whether you'd like it to act as a scientific, graphing, or programing calculator, which allows you to do anything from plotting a linear equation to solving matrices. It can be used in any class that requires a complex calculator. You don't have to register for the site, but if you do, you'll be able to post questions in the forums. There's also an option to create a widget that you can add to your own website.

Regular graphing calculators can cost at least $100. Web2.0Calc.com provides the same capabilities for free. Other sites, like Fooplot, offer similar tools, but Web2.0Calc.com has a broader range of calculating options.

Read More Read LessIt's simply a tool, so learning really depends on who is using it and what they're using it for. Compared to an actual graphing calculator, the price (free) can't be beat, and it serves the same purpose. However, Web2.0Calc.com could be improved by the addition of support for teachers using it with their classes. Currently, teachers who use it need to design their own activities and instruction sheets to help kids use Web2.0Calc.com effectively. A nice bonus: There's a free online math help forum. However, anyone can post responses to the questions, so reliability and quality of help varies.

Read More Read Less## Key Standards Supported

## Interpreting Categorical And Quantitative Data | |

HSS.ID: Interpret Linear Models | |

HSS.ID.8 | Compute (using technology) and interpret the correlation coefficient of a linear fit. |

Summarize, Represent, And Interpret Data On A Single Count Or Measurement Variable | |

HSS.ID.4 | Use the mean and standard deviation of a data set to fit it to a normal distribution and to estimate population percentages. Recognize that there are data sets for which such a procedure is not appropriate. Use calculators, spreadsheets, and tables to estimate areas under the normal curve. |

Summarize, Represent, And Interpret Data On Two Categorical And Quantitative Variables | |

HSS.ID.6 | Represent data on two quantitative variables on a scatter plot, and describe how the variables are related. |

## Interpreting Functions | |

HSF.IF: Analyze Functions Using Different Representations | |

HSF.IF.7 | Graph functions expressed symbolically and show key features of the graph, by hand in simple cases and using technology for more complicated cases.★ |

## Reasoning With Equations And Inequalities | |

HSA.REI: Represent And Solve Equations And Inequalities Graphically | |

HSA.REI.11 | Explain why the x-coordinates of the points where the graphs of the equations y = f(x) and y = g(x) intersect are the solutions of the equation f(x) = g(x); find the solutions approximately, e.g., using technology to graph the functions, make tables of values, or find successive approximations. Include cases where f(x) and/or g(x) are linear, polynomial, rational, absolute value, exponential, and logarithmic functions.★ |

HSA.REI.12 | Graph the solutions to a linear inequality in two variables as a half- plane (excluding the boundary in the case of a strict inequality), and graph the solution set to a system of linear inequalities in two variables as the intersection of the corresponding half-planes. |

Solve Systems Of Equations | |

HSA.REI.6 | Solve systems of linear equations exactly and approximately (e.g., with graphs), focusing on pairs of linear equations in two variables. |

HSA.REI.7 | Solve a simple system consisting of a linear equation and a quadratic equation in two variables algebraically and graphically. For example, find the points of intersection between the line y = –3x and the circle x2 + y2 = 3. |

## Trigonometric Functions | |

HSF.TF: Model Periodic Phenomena With Trigonometric Functions | |

HSF.TF.7 | (+) Use inverse functions to solve trigonometric equations that arise in modeling contexts; evaluate the solutions using technology, and interpret them in terms of the context.★ |

## Vector And Matrix Quantities | |

HSN.VM: Perform Operations On Matrices And Use Matrices In Applications. | |

HSN.VM.7 | (+) Multiply matrices by scalars to produce new matrices, e.g., as when all of the payoffs in a game are doubled. |

HSN.VM.8 | (+) Add, subtract, and multiply matrices of appropriate dimensions. |