PreAlgebra on Khan Academy: No way, this isn't your run of the mill arithmetic. This is Prealgebra. You're about to play with the professionals. Think of prealgebra as a runway. You're the airplane and algebra is your sunny vacation destination. Without the runway you're not going anywhere. Seriously, the foundation for all higher mathematics is laid with many of the concepts that we will introduce to you here: negative numbers, absolute value, factors, multiples, decimals, and fractions to name a few. So buckle up and move your seat into the upright position. We're about to take off!
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using stateoftheart, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
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Lessons 

1) Negative numbers introduction  Negative numbers and absolute value  PreAlgebraMysterious negative numbers! What ARE they? They are numbers less than zero. If you understand the nature of below zero temperatures, you can understand negative numbers. We'll help. Practice this ...489 views

2) Adding/subtracting negative numbers  PreAlgebraAdding and subtracting negative numbers509 views

3) Multiplying and dividing negative numbers  PreAlgebraMultiplying and dividing negative numbers580 views

4) Adding and subtracting fractions  Fractions  PreAlgebraHow to add and subtract fractions. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...540 views

5) Multiplying fractions (old)Multiplying fractions491 views

6) Dividing fractionsDividing fractions601 views

7) Introduction to order of operations  Arithmetic properties  PreAlgebraThis example clarifies the purpose of order of operations: to have ONE way to interpret a mathematical statement. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy ...553 views

8) Order of operations: PEMDAS  Arithmetic properties  PreAlgebraWork through another challenging order of operations example with only positive numbers. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...595 views

9) Level 1 ExponentsBasic Exponents552 views

10) Level 2 Exponentsnegative exponents590 views

11) Level 3 exponentsfractional exponents586 views

12) Negative exponent intuition  PreAlgebraIntuition on why a^b = 1/(a^b) (and why a^0 =1) Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...562 views

13) Exponent rules part 1  Exponents, radicals, and scientific notation  PreAlgebraIntroduction to exponent rules Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...630 views

14) Exponent rules part 2  Exponents, radicals, and scientific notation  PreAlgebra2 more exponent rules with an introduction to composite problems Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...601 views

15) Simplifying radicals  Exponents, radicals, and scientific notation  PreAlgebraUsing exponent rules to simplify radicals or square roots Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...524 views

16) Introduction to LogarithmsAn introduction to logarithms606 views

17) Unit conversion within the metric system  PreAlgebraMetric unit conversion538 views

18) Speed translation  Ratios, proportions, units, and rates  PreAlgebraTranslating speed units502 views

19) Introduction to logarithm properties  Logarithms  Algebra IIIntroduction to the first two logarithm properties.585 views

20) Introduction to logarithm properties (part 2)  Logarithms  Algebra IISecond part of the introduction to logarithm properties.666 views

21) Introduction to scientific notation  PreAlgebraIntroduction to scientific notation. An indepth discussion about why and how scientific notation is used. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/ma ...559 views

22) Scientific notation examples  PreAlgebraMore scientific notation examples Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...594 views

23) Unit conversion word problem: drug dosage  Introduction to algebra  Algebra IFuture doctors and nurses out there, take note. This unit conversion word problem deals with converting drug dosage units, something that is commonly done in hospitals. Give it a try with us. Pract ...542 views

24) Common divisibility examples  Factors and multiples  PreAlgebraCommon Divisibility Examples Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...607 views

25) Binary NumbersUnderstanding how numbers are represented. Introduction to binary numbers514 views

26) Binary, Decimal and Hexadecimal Number SystemsConceptualizing different number systems544 views

27) Number Base Conversion PracticeConverting between decimal, binary and hexadecimal number systems622 views

28) Significant figures  Decimals  PreAlgebraIntroduction to significant figures Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...662 views

29) More on significant figures  Decimals  PreAlgebraUnderstanding the "rules of thumb" for significant figures Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...600 views

30) Multiplying and dividing with significant figures  Decimals  PreAlgebraMultiplying and dividing with significant figures Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...538 views

31) Addition and subtraction with significant figures  Decimals  PreAlgebraAddition and Subtraction with Significant Figures Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...655 views

32) Pure Numbers and Significant DigitsPure Numbers and Significant Digits543 views

33) Ordering negative numbers  Negative numbers and absolute value  PreAlgebraIs 40 bigger than 10? When ordering negative numbers from least to greatest, careful that you don't get hung up on the "amount" of the number. Think about what that negative sign really means! Pr ...508 views

34) Comparing absolute values  Negative numbers and absolute value  PreAlgebraWhen we compare numbers we use the concepts of greater than, less than, and equal to (=). The same is true of absolute values. Practice this lesson yourself on KhanAcademy.org right now: https://ww ...611 views

35) Comparing and ordering fractions  Fractions  PreAlgebraFinding common denominators of multiple fractions to order them Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...553 views

36) Inverse property of multiplication  Arithmetic properties  PreAlgebraSimple idea that multiplying by a numbers multiplicative inverse gets you back to one494 views

37) Inverse property of addition  Arithmetic properties  PreAlgebraThe simple idea that a number plus its negative is 0521 views

38) Interpreting linear graphs word problems example 1  Algebra IInterpreting Linear Graphs Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/a ...578 views

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