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!
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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 ...546 views

2) Adding/subtracting negative numbers  PreAlgebraAdding and subtracting negative numbers546 views

3) Multiplying and dividing negative numbers  PreAlgebraMultiplying and dividing negative numbers609 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 ...577 views

5) Multiplying fractions (old)Multiplying fractions522 views

6) Dividing fractionsDividing fractions634 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 ...616 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 ...632 views

9) Level 1 ExponentsBasic Exponents580 views

10) Level 2 Exponentsnegative exponents616 views

11) Level 3 exponentsfractional exponents610 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 ...592 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 ...683 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 ...640 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 ...556 views

16) Introduction to LogarithmsAn introduction to logarithms653 views

17) Unit conversion within the metric system  PreAlgebraMetric unit conversion561 views

18) Speed translation  Ratios, proportions, units, and rates  PreAlgebraTranslating speed units533 views

19) Introduction to logarithm properties  Logarithms  Algebra IIIntroduction to the first two logarithm properties.608 views

20) Introduction to logarithm properties (part 2)  Logarithms  Algebra IISecond part of the introduction to logarithm properties.703 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 ...581 views

22) Scientific notation examples  PreAlgebraMore scientific notation examples Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...614 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 ...576 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 ...644 views

25) Binary NumbersUnderstanding how numbers are represented. Introduction to binary numbers536 views

26) Binary, Decimal and Hexadecimal Number SystemsConceptualizing different number systems575 views

27) Number Base Conversion PracticeConverting between decimal, binary and hexadecimal number systems643 views

28) Significant figures  Decimals  PreAlgebraIntroduction to significant figures Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...680 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 ...627 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 ...566 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 ...676 views

32) Pure Numbers and Significant DigitsPure Numbers and Significant Digits565 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 ...535 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 ...641 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 ...572 views

36) Inverse property of multiplication  Arithmetic properties  PreAlgebraSimple idea that multiplying by a numbers multiplicative inverse gets you back to one511 views

37) Inverse property of addition  Arithmetic properties  PreAlgebraThe simple idea that a number plus its negative is 0545 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 ...599 views

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