In this video, Salman Khan of Khan Academy shows why borrowing works.
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Khan Academy
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Great site to use to get a scientific calculator to solve or check your problems you are working on. Larger and easy to use.
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Scientific Calculator
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Practice all types of math facts. Select addition, subtraction, multiplication, or division. There is also an option for "algebra" style.
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FunBrain
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This page includes order of operations worksheets suitable for elementary and middle school students. Usually good for lessons on PEMDAS.
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Math-Drills.com
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Choose an operation to practice your basic math skills. Your practice is timed and will report to you how many you got right or wrong.
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Math.com
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This website will make number lines for you to use. Then you can print the number lines for help with your homework or other math needs.
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The Math Worksheet Generator
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Helps you learn the correct order of operations when doing calculations.
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Math is Fun
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A functional scientific calculator with the look and feel of a real calculator for teaching how to use a calculator over the web.
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Calculator.com
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Create worksheets for various difficulties of subtraction
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SuperKids
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In this video, Salman Khan of Khan Academy demonstrates basic subtraction.
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Khan Academy
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