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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

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

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 n Sides
Surface 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

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

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

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

Health and Fitness

How Do Cloth Diapers Compare to Disposable Diapers?
How to Make Homemade Cough Syrup
How to Compute Pregnancy Due Date
How to Compute BAC
How to Determine Your Bra Size
How Long Does it Take to Burn Calories?
How to Calculate Basal Metabolic Rate
How to Take Care of an Exercise Ball