# 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 Maze Generator

Printable Random Dots Generator

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

Free Printable Grid, Graph, and Lined Paper

Free Printable Multiplication Worksheets and Times Table

Free Printable Circle Geometry Worksheet

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 Random Dots Generator

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

Free Printable Grid, Graph, and Lined Paper

Free Printable Multiplication Worksheets and Times Table

Free Printable Circle Geometry Worksheet

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

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

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

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

### Education

Secular Homeschooling Resources

Pros and Cons of Online Nursing Degrees

Pros and Cons of Getting an Online Degree in Psychology

About Taking the GED Test in Spanish

How to Score High on GED Language Arts Writing

How to Score High on GED Math

Pros and Cons of Online Nursing Degrees

Pros and Cons of Getting an Online Degree in Psychology

About Taking the GED Test in Spanish

How to Score High on GED Language Arts Writing

How to Score High on GED Math

### Careers and Training

How to Become a PMP

How to Become a Certified Paralegal

How to Earn a Paralegal Degree Online

How to Become a Fireworks Technician or Pyrotechnician

How to Become a Licensed Sex Therapist

MBA Programs That Don't Require the GMAT

How to Get a High Score on the ASVAB

How to Become a Cop

How to Become a Pilates Instructor

How to Become a Certified Paralegal

How to Earn a Paralegal Degree Online

How to Become a Fireworks Technician or Pyrotechnician

How to Become a Licensed Sex Therapist

MBA Programs That Don't Require the GMAT

How to Get a High Score on the ASVAB

How to Become a Cop

How to Become a Pilates Instructor

### Technology and Computing

What Is My IP Address?

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 Build a Website from Scratch: Part 1

How to Build a Website from Scratch: Part 2

How to Encrypt HTML and JavaScript (and decrypt it too)

The Most Popular Web Design Programs

How to Fix a Stuck Pixel

How to Calculate Call Center Stats with the Erlang B Formula

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 Build a Website from Scratch: Part 1

How to Build a Website from Scratch: Part 2

How to Encrypt HTML and JavaScript (and decrypt it too)

The Most Popular Web Design Programs

How to Fix a Stuck Pixel

How to Calculate Call Center Stats with the Erlang B Formula

### Health and Fitness

How Do Cloth Diapers Compare to Disposable Diapers?

How to Make Homemade Cough Syrup

How to Spot the Signs of Meth Addiction in Older Women

How to Compute Pregnancy Due Date

How to Compute BAC

How to Determine Your Bra Size

Natural Remedies to Reduce Acne Scars and Fade Macules

How Long Does it Take to Burn Calories?

What Are the Causes of Testicular Pain?

How to Calculate Basal Metabolic Rate

How Can I Raise Testosterone Levels Naturally?

How to Take Care of an Exercise Ball

Where Can I Get a Medicinal Marijuana Card?

How to Increase the Chance of Conceiving a Girl

How to Increase the Chance of Conceiving a Boy

How to Make Homemade Cough Syrup

How to Spot the Signs of Meth Addiction in Older Women

How to Compute Pregnancy Due Date

How to Compute BAC

How to Determine Your Bra Size

Natural Remedies to Reduce Acne Scars and Fade Macules

How Long Does it Take to Burn Calories?

What Are the Causes of Testicular Pain?

How to Calculate Basal Metabolic Rate

How Can I Raise Testosterone Levels Naturally?

How to Take Care of an Exercise Ball

Where Can I Get a Medicinal Marijuana Card?

How to Increase the Chance of Conceiving a Girl

How to Increase the Chance of Conceiving a Boy