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How To: Write an analytical proof of the quadratic formula

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to write a formal analytical proof of the quadratic formula.

How To: Calculate bonuses based on years worked in MS Excel

New to Microsoft Excel? Looking for a tip? How about a tip so mind-blowingly useful as to qualify as a magic trick? You're in luck. In this MS Excel tutorial from ExcelIsFun, the 601st installment in their series of digital spreadsheet magic tricks, you'll learn how to use the VLOOKUP & IF functions to make bonus calculations based on the number of years worked.

How To: Allow only Monday dates in a cell in Microsoft Excel

New to Microsoft Excel? Looking for a tip? How about a tip so mind-blowingly useful as to qualify as a magic trick? You're in luck. In this MS Excel tutorial from ExcelIsFun, the 593rd installment in their series of digital spreadsheet magic tricks, you'll learn how to add data validation to allow only Monday dates in a cell using the custom option and the WEEKDAY function.

How To: Count with four criteria in Microsoft Excel

New to Microsoft Excel? Looking for a tip? How about a tip so mind-blowingly useful as to qualify as a magic trick? You're in luck. In this MS Excel tutorial from ExcelIsFun, the 596th installment in their series of digital spreadsheet magic tricks, you'll learn how to use the SERACH, ISNUMBER and SUMPRODUCT functions to count with 4 criteria including an all criteria option.

How To: Count times exceeding 5 minutes in Microsoft Excel

New to Microsoft Excel? Looking for a tip? How about a tip so mind-blowingly useful as to qualify as a magic trick? You're in luck. In this MS Excel tutorial from ExcelIsFun and Mr. Excel, the 17th installment in their joint series of digital spreadsheet magic tricks, you'll learn how to create 5 formulas to count times greater than five minutes using Excel's COUNTIF and TIME functions.

How To: Retrieve multiple values from a horizontal Excel table

hether you're interested in learning Microsoft Excel from the bottom up or just looking to pick up a few tips and tricks, you've come to the right place. In this tutorial from everyone's favorite digital spreadsheet guru, ExcelIsFun, the 21st installment in his "Highline Excel Class" series of free video Excel lessons, you'll learn how to use the HLOOKUP and ROWS function to retrieve multiple values from a horizontal table.

How To: Filter data in eight different ways in Microsoft Excel

hether you're interested in learning Microsoft Excel from the bottom up or just looking to pick up a few tips and tricks, you've come to the right place. In this tutorial from everyone's favorite digital spreadsheet guru, ExcelIsFun, the 17th installment in his "Highline Excel Class" series of free video Excel lessons, you'll learn how to filter spreadsheet data using eight different methods.

How To: Reference worksheets and workbooks in Excel formulas

Whether you're interested in learning Microsoft Excel from the bottom up or just looking to pick up a few tips and tricks, you've come to the right place. In this tutorial from everyone's favorite digital spreadsheet guru, ExcelIsFun, the 6th installment in his "Highline Excel Class" series of free video Excel lessons, you'll learn how to create worksheet and workbook references in formulas.

How To: Multiply & sum arrays with Excel's SUMPRODUCT

Whether you're interested in learning Microsoft Excel from the bottom up or just looking to pick up a few tips and tricks, you've come to the right place. In this tutorial from everyone's favorite digital spreadsheet guru, ExcelIsFun, the 37th installment in his "Highline Excel Class" series of free video Excel lessons, you'll learn how to work with MS Excel's SUMPRODUCT function.

How To: Create projections for sales numbers in MS Excel

Whether you're interested in learning Microsoft Excel from the bottom up or just looking to pick up a few tips and tricks, you're in the right place. In this tutorial from everyone's favorite digital spreadsheet guru, ExcelIsFun, the 10th installment in his "Highline Excel Class" series of free video Excel lessons, you'll learn how to create projections for sales numbers from a database using the SUMIF, VLOOKUP and COLUMNS functions and a percentage increase formula.

How To: Calculate future value for an annuity in MS Excel

As you might guess, one of the domains in which Microsoft Excel really excels is business math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, the 60th installment in his "Excel Business Math" series of free video lessons, you'll learn how to use the Excel functions FV and PMT to make a future value calculation for an annuity.

How To: Calculate present value for an annuity in MS Excel

As you might guess, one of the domains in which Microsoft Excel really excels is business math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, the 61st installment in his "Excel Business Math" series of free video lessons, you'll learn how to use the Excel functions PV and PMT to make a present value calculation for an annuity.

How To: Calculate a standard (z) score in Microsoft Excel

If you use Microsoft Excel on a regular basis, odds are you work with numbers. Put those numbers to work. Statistical analysis allows you to find patterns, trends and probabilities within your data. In this MS Excel tutorial from everyone's favorite Excel guru, YouTube's ExcelsFun, the 45th installment in his "Excel Statistics" series of free video lessons, you'll learn how to see how to calculate a z-score.

How To: Calculate geometric average in Excel with GEOMEAN

If you use Microsoft Excel on a regular basis, odds are you work with numbers. Put those numbers to work. Statistical analysis allows you to find patterns, trends and probabilities within your data. In this MS Excel tutorial from everyone's favorite Excel guru, YouTube's ExcelsFun, the 35.2nd installment in his "Excel Statistics" series of free video lessons, you'll learn how to use Excel's GEOMEAN function to find geometric mean.

How To: Add current stock prices to an Excel table

As you might guess, one of the domains in which Microsoft Excel really excels is business math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, the 33rd installment in his "Excel Business Math" series of free video lessons, you'll learn how to add current stock prices to a stock analysis table in Excel using a web query.

How To: Work with series trade discounts in Microsoft Excel

As you might guess, one of the domains in which Microsoft Excel really excels is business math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, the 44th installment in his "Excel Business Math" series of free video lessons, you'll learn how to work with series trade discounts in MS Excel.

How To: Calculate gross and overtime pay in Microsoft Excel

As you might guess, one of the domains in which Microsoft Excel really excels is business math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, the 38th installment in his "Excel Business Math" series of free video lessons, you'll learn how to calculate gross and overtime pay in MS Excel.

How To: Calculate payroll deductions given a hurdle in Excel

As you might guess, one of the domains in which Microsoft Excel really excels is business math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, the 41st installment in his "Excel Business Math" series of free video lessons, you'll learn how to calculate deductions from paychecks when there is a ceiling or max taxable amount or hurdle.

How To: Calculate income tax payroll deductions in MS Excel

As you might guess, one of the domains in which Microsoft Excel really excels is business math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, the 42nd installment in his "Excel Business Math" series of free video lessons, you'll learn about the wage bracket and percentage methods for calculating federal income tax payroll deductions.

How To: Determine prime factors & reduce fractions in MS Excel

As you might guess, one of the domains in which Microsoft Excel really excels is business math. Brush up on the stuff for your next or current job with this how-to. In this tutorial from everyone's favorite digital spreadsheet guru, YouTube's ExcelIsFun, the 17th installment in his "Excel Business Math" series of free video lessons, you'll learn how to define prime numbers, determine prime factors, reduce fractions (i.e., write fractions in their lowest terms) and convert mixed numbers to imp...

How To: Find range and interquartile range in Microsoft Excel

If you use Microsoft Excel on a regular basis, odds are you work with numbers. Put those numbers to work. Statistical analysis allows you to find patterns, trends and probabilities within your data. In this MS Excel tutorial from everyone's favorite Excel guru, YouTube's ExcelsFun, the 40th installment in his "Excel Statistics" series of free video lessons, you'll learn how to calculate range & interquartile range for variability using the MAX, MIN, QUARTILE functions.

How To: Create a basic array formula in Microsoft Excel

Looking for a primer on how to create and work with arrays in Microsoft Office Excel? You've come to the right place. In this free video tutorial from everyone's favorite MS Excel guru, YouTube's ExcelIsFun, the very first installment in his series of Excel array formula series, you'll learn how to create a basic array formula. Learn about the syntax, the Ctrl + Shift + Enter method of formula entry and the curly brackets that get entered automatically by Excel.

How To: Count the number of characters in an Excel cell range

Looking for a primer on how to create and work with array formulas in Microsoft Office Excel? You've come to the right place. In this free video tutorial from everyone's favorite MS Excel guru, YouTube's ExcelIsFun, the 9th installment in his series of Excel array formula series, you'll learn create array formula that counts all the characters in a range of cells.

How To: Multiply matrices with the MMULT function in MS Excel

Looking for a primer on how to create and work with array formulas in Microsoft Office Excel? You've come to the right place. In this free video tutorial from everyone's favorite MS Excel guru, YouTube's ExcelIsFun, the 12th installment in his series of Excel array formula series, you'll learn how to use the array function MMULT to multiply multiple matrices in matrix algebra. (NB: This is an array function that requires the Ctrl + Shift + Enter trick.)

How To: Use dynamic range names in Excel 2007 tables

Looking for a primer on how to create and work with names in Microsoft Office Excel? You've come to the right place. In this free video tutorial from everyone's favorite MS Excel guru, YouTube's ExcelIsFun, the 12th installment in his series of Excel name tricks, you'll learn how to use the built-in dynamic range names in Excel 2007 Tables.

How To: Name cell ranges with relative references in MS Excel

Looking for a primer on how to create and work with names in Microsoft Office Excel? You've come to the right place. In this free video tutorial from everyone's favorite MS Excel guru, YouTube's ExcelIsFun, the 8th installment in his series of Excel name tricks, you'll learn how to name cell ranges with relative cell references instead of the default absolute cell references.

How To: Create confidence intervals for proportions in Excel

If you use Microsoft Excel on a regular basis, odds are you work with numbers. Put those numbers to work. Statistical analysis allows you to find patterns, trends and probabilities within your data. In this MS Excel tutorial from everyone's favorite Excel guru, YouTube's ExcelsFun, the 86th installment in his "Excel Statistics" series of free video lessons, you'll learn how to construct confidence intervals for proportions using NORMSINV function and other formulas.

How To: Find the sample size for confidence intervals in Excel

If you use Microsoft Excel on a regular basis, odds are you work with numbers. Put those numbers to work. Statistical analysis allows you to find patterns, trends and probabilities within your data. In this MS Excel tutorial from everyone's favorite Excel guru, YouTube's ExcelsFun, the 87th installment in his "Excel Statistics" series of free video lessons, you'll learn how to calculate sample size (n) for confidence intervals.

How To: Plot data with Microsoft Excel's REPT & COUNTIF tools

If you use Microsoft Excel on a regular basis, odds are you work with numbers. Put those numbers to work. Statistical analysis allows you to find patterns, trends and probabilities within your data. In this MS Excel tutorial from everyone's favorite Excel guru, YouTube's ExcelsFun, the 27th installment in his "Excel Statistics" series of free video lessons, you'll learn how to create a quantitative data dot plot chart using the REPT and COUNTIF functions.

How To: Create a cumulative frequency distribution in MS Excel

If you use Microsoft Excel on a regular basis, odds are you work with numbers. Put those numbers to work. Statistical analysis allows you to find patterns, trends and probabilities within your data. In this MS Excel tutorial from everyone's favorite Excel guru, YouTube's ExcelsFun, the 26th installment in his "Excel Statistics" series of free video lessons, you'll learn how to create quantitative data cumulative frequency distributions with pivot tables.

How To: Cross tabulate categorical data in Microsoft Excel

If you use Microsoft Excel on a regular basis, odds are you work with numbers. Put those numbers to work. Statistical analysis allows you to find patterns, trends and probabilities within your data. In this MS Excel tutorial from everyone's favorite Excel guru, YouTube's ExcelsFun, the 16th installment in his "Excel Statistics" series of free video lessons, you'll learn how to cross tabulate & do percentage cross tabulation for categorical data using a pivot table (PivotTable).

How To: Group categories in an Excel frequency distribution

If you use Microsoft Excel on a regular basis, odds are you work with numbers. Put those numbers to work. Statistical analysis allows you to find patterns, trends and probabilities within your data. In this MS Excel tutorial from everyone's favorite Excel guru, YouTube's ExcelsFun, the 19th installment in his "Excel Statistics" series of free video lessons, you'll learn how to group categories in a frequency distribution with a formula (2 COUNTIF) and the pivot table (PivotTable) grouping fea...

How To: Cross tabulate categorical data with formulas in Excel

If you use Microsoft Excel on a regular basis, odds are you work with numbers. Put those numbers to work. Statistical analysis allows you to find patterns, trends and probabilities within your data. In this MS Excel tutorial from everyone's favorite Excel guru, YouTube's ExcelsFun, the 17th installment in his "Excel Statistics" series of free video lessons, you'll learn how to cross tabulate & do percentage cross tabulation for categorical data using formulas rather than pivot tables.

How To: Use Microsoft Excel's sort and pivot table tools

If you use Microsoft Excel on a regular basis, odds are you work with numbers. Put those numbers to work. Statistical analysis allows you to find patterns, trends and probabilities within your data. In this MS Excel tutorial from everyone's favorite Excel guru, YouTube's ExcelsFun, the 3rd installment in his "Excel Statistics" series of free video lessons, you'll learn how to use Excel's sorting and pivot tables (PivotTables) data analysis tools.