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# Popular Articles

Read some of the most popular articles on Had2know below, or use the category navigation on the left to read all of our features.

### Free Printables

Printable Random Dots Generator

Printable Tables of Logs, Trig, Inverse Trig, and Radicals

Free Printable Multiplication Worksheets and Times Table

Free Printable Quadratic Equations Worksheet

Printable Amortization Table and Calculator

Printable Balloon Mortgage Amortization Table and Calculator

Printable Canadian Amortization Table and Calculator

Printable Table of Integrals

Printable Trig and Angles Cheat Sheet

Periodic Table of Elements

Printable Time Card Calculator

Free Printable Time Sheet

Free Printable US Currency Play Money

Printable Tables of Logs, Trig, Inverse Trig, and Radicals

Free Printable Multiplication Worksheets and Times Table

Free Printable Quadratic Equations Worksheet

Printable Amortization Table and Calculator

Printable Balloon Mortgage Amortization Table and Calculator

Printable Canadian Amortization Table and Calculator

Printable Table of Integrals

Printable Trig and Angles Cheat Sheet

Periodic Table of Elements

Printable Time Card Calculator

Free Printable Time Sheet

Free Printable US Currency Play Money

### Business Math and Financial Calculators

How to Find the Future Value of an Annuity

Student Loan Payment Calculator

Four Key Business Ratios

10 Key Ratios in Stock Trading and Investing

Using the Rules of 69, 70, & 72

How to Calculate Acid Test Ratio (Quick Ratio or Liquid Ratio)

Difference Between Price Markup and Gross Profit Margin

How to Calculate Graduated Payment Mortgages

What is the Maximum Interest Rate I Can Afford?

What is Yield to Maturity? (Bond Valuation)

How Does a Biweekly Mortgage Differ from a Monthly Mortgage?

How Long Will It Take to Pay Off a Loan?

How Much Can I Afford to Borrow?

What is Amortization?

How to Calculate the Remaining Balance on a Home Mortgage

How to Compute the Margin of Error

How to Compute Geometric Mean Return

How Long to Pay Off Credit Card Balance If Making Minimum Monthly Payments

Savings Account Calculator

Retirement Savings Calculator

Student Loan Payment Calculator

Four Key Business Ratios

10 Key Ratios in Stock Trading and Investing

Using the Rules of 69, 70, & 72

How to Calculate Acid Test Ratio (Quick Ratio or Liquid Ratio)

Difference Between Price Markup and Gross Profit Margin

How to Calculate Graduated Payment Mortgages

What is the Maximum Interest Rate I Can Afford?

What is Yield to Maturity? (Bond Valuation)

How Does a Biweekly Mortgage Differ from a Monthly Mortgage?

How Long Will It Take to Pay Off a Loan?

How Much Can I Afford to Borrow?

What is Amortization?

How to Calculate the Remaining Balance on a Home Mortgage

How to Compute the Margin of Error

How to Compute Geometric Mean Return

How Long to Pay Off Credit Card Balance If Making Minimum Monthly Payments

Savings Account Calculator

Retirement Savings Calculator

### Mathematics and Homework Help

Gaussian (Normal) Random Number Generator

Cubic Equation Solver

The Arithmetic-Geometric Mean

What are "Happy Numbers" and "Unhappy Numbers?"

Δ Side, Angle, & Area Calculator

Printable Trig and Angles Cheat Sheet

How to Solve Quadratic Equations

How to Calculate Mega Millions Lottery Odds

How to Calculate Powerball Lottery Odds

How to Survive College Calculus

How to Solve Word Problems About Train Speeds

How to Solve Math Problems About Combined Work

Whether or Not a Number is Prime or Composite

Descriptive Statistics Calculator

How to Convert a Number to Roman Numerals

Length, Area, & Volume Conversions

Area of a Regular Polygon with

Surface Area and Volume of a Torus

Cubic Equation Solver

The Arithmetic-Geometric Mean

What are "Happy Numbers" and "Unhappy Numbers?"

Δ Side, Angle, & Area Calculator

Printable Trig and Angles Cheat Sheet

How to Solve Quadratic Equations

How to Calculate Mega Millions Lottery Odds

How to Calculate Powerball Lottery Odds

How to Survive College Calculus

How to Solve Word Problems About Train Speeds

How to Solve Math Problems About Combined Work

Whether or Not a Number is Prime or Composite

Descriptive Statistics Calculator

How to Convert a Number to Roman Numerals

Length, Area, & Volume Conversions

Area of a Regular Polygon with

*n*SidesSurface Area and Volume of a Torus

### Home and Garden

Roof Snow Load Calculator

Rafter Length Calculator

Number of Drywall Panels Needed

How to Estimate Siding Accurately

How to Estimate Roofing Materials

How Many Gallons of Paint Needed

Tips for Planting Grass in Clay Soil

How Many Bricks Do I Need to Pave a Patio or Driveway?

Brick Pattern Designs

How to Install Liner to Make a Shower Pan

How to Grow a Tree with 2 Kinds of Fruit

How to Braid a Money Tree

Rafter Length Calculator

Number of Drywall Panels Needed

How to Estimate Siding Accurately

How to Estimate Roofing Materials

How Many Gallons of Paint Needed

Tips for Planting Grass in Clay Soil

How Many Bricks Do I Need to Pave a Patio or Driveway?

Brick Pattern Designs

How to Install Liner to Make a Shower Pan

How to Grow a Tree with 2 Kinds of Fruit

How to Braid a Money Tree

### Education

How to Ace the GED

How to Survive the GMAT

7 Tips to Enrich Your Vocabulary and Become Articulate

How to Score High on GED Math

How to Survive the GMAT

7 Tips to Enrich Your Vocabulary and Become Articulate

How to Score High on GED Math

### Careers and Training

How to Become a PMP

How to Get a High Score on the ASVAB

How to Ace ASVAB Arithmetic

MBA Programs That Don't Require the GMAT

How to Find Engineering PDH Credits

How to Become a Pilates Instructor

How to Get a High Score on the ASVAB

How to Ace ASVAB Arithmetic

MBA Programs That Don't Require the GMAT

How to Find Engineering PDH Credits

How to Become a Pilates Instructor

### Technology and Computing

How to Calculate Color Contrast

How to Graph Functions with Excel

How to Copy File Names in a Folder

How to Let Website Visitors Change the Background and Text Colors

How to Convert to Military Time, aka 24-Hour Clock

How to Calculate Call Center Stats with the Erlang B Formula

How to Graph Functions with Excel

How to Copy File Names in a Folder

How to Let Website Visitors Change the Background and Text Colors

How to Convert to Military Time, aka 24-Hour Clock

How to Calculate Call Center Stats with the Erlang B Formula