Start here if you have very little background in math fundamentals (or just want to make sure you do).
Arithmetic on Khan Academy: So you're ready to have some arithmetic fun? You've come to the right spot! It's the first "official" math topic and chalked full of fun exercises and great videos which help you start your journey towards math mastery. We'll cover the big ones: addition, subtraction, multiplication, and division, of course. But we don't stop there. We'll get into negative numbers, absolute value, decimals, and fractions, too. Learning math should be fun, and we plan on having some with you. Ready to get started?
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) Basic addition  Addition and subtraction  ArithmeticIntroduction to addition. Multiple visual ways to represent addition. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ...659 views

2) Addition 2Adding 2digit numbers657 views

3) Level 2 AdditionAdding a 2 digit number to a 1 digit number. Introduction to carrying. More free lessons at: http://www.khanacademy.org/video?v=27Kp7775 views

4) Addition 3Practice carrying digits to add multiple digit numbers685 views

5) Addition 4  Addition and subtraction  ArithmeticMore practice carrying with multiple digit numbers Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ...736 views

6) Basic subtraction  Addition and subtraction  ArithmeticIntroduction to subtraction Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ...783 views

7) Subtraction 2  Addition and subtraction  ArithmeticDifferent ways to view subtraction Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ...890 views

8) Subtraction 3: Introduction to Borrowing or RegroupingIntroduction to borrowing and regrouping787 views

9) Alternate mental subtraction method  Addition and subtraction  ArithmeticHow I subtract in my head Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ...769 views

10) Why borrowing worksAn explanation of why (not how) borrowing/regrouping works when subtracting numbers931 views

11) Level 4 SubtractionSubtraction of multidigit numbers involving borrowing756 views

12) Adding Decimals (Old)Adding decimals669 views

13) Subtracting decimals (old)  Decimals  PreAlgebraSubtracting decimal numbers Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...748 views

14) Basic multiplication  Multiplication and division  ArithmeticIntroduction to multiplication Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ...630 views

15) Multiplication 2: The multiplication tables  ArithmeticIntroduction to the multiplication tables from 29.782 views

16) Multiplication 3: 10,11,12 times tables  Multiplication and division  ArithmeticMultiplication 3: Learning to multiply 10, 11, and 12.759 views

17) 2digit times a 2digit number  Multiplication and division  ArithmeticMultiplying a 2digit number times a 2digit number Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ...684 views

18) Multiplying multiple digit numbers  Multiplication and division  ArithmeticWorking our way up to multiplying multipledigit numbers with each other. We'll go slow so you can follow along. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy. ...652 views

19) Multiplication 7: Old video giving more examples  Arithmetic2 examples of multiplying a 3 digit number times a 2 digit number. 1 example of multiplying a 3 digit number times a 3 digit number.720 views

20) Mulitplication 8: Multiplying decimals (Old video)Multiplying decimals (www.khanacademy.org)637 views

21) Lattice multiplication  Multiplication and division  ArithmeticIntroduction to lattice multiplication641 views

22) Why lattice multiplication works  Multiplication and division  ArithmeticUnderstanding why lattice multiplication works767 views

23) Division 1  Multiplication and division  ArithmeticIntroduction to division Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ...712 views

24) Introduction to long division  Multiplication and division  ArithmeticDividing into larger numbers. Introduction to long division without remainders Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ...774 views

25) Dividing numbers: long division with remainders  ArithmeticHere we go with more long division practice. Ever wonder why we call it "long" division? What's "long" about it, anyway? Practice this lesson yourself on KhanAcademy.org right now: https://www.khan ...665 views

26) Level 4 division  Multiplication and division  ArithmeticHere's another practice example where you divide by two digits. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/arithme ...697 views

27) Converting fractions to decimals  Decimals  PreAlgebraHow to express a fraction as a decimal Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...646 views

28) Percent and decimalsExpressing percentages as decimals. Expressing decimals as percentages.705 views

29) Dividing decimals with hundredths example 3  Decimals  PreAlgebraThe old saying is "practice makes perfect." Let's keep practicing dividing decimals and making our divisor a whole number. Practice this lesson yourself on KhanAcademy.org right now: https://www.kh ...730 views

30) Ordering Numeric ExpressionsConverting percentages and fractions to decimals to order numbers644 views

31) Greatest common factor explained  Factors and multiples  PreAlgebraHere's a nice explanation of least common factor (or least common divisor) along with a few practice example exercises. Let's roll. Practice this lesson yourself on KhanAcademy.org right now: https ...787 views

32) Equivalent fractions  Fractions  PreAlgebraIntroduces the concept of equivalent fractions Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...657 views

33) Mixed numbers and improper fractions  Fractions  PreAlgebraConverting mixed numbers to improper fractions and improper fractions to mixed numbers Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/prealg ...789 views

34) Time Differences 1Finding how long passes between two times664 views

35) Time Differences in Different Time ZonesCalculating flight times across time zones644 views

36) Prime numbers  Factors and multiples  PreAlgebraWhat does it mean to be a prime number? Let's progress though some whole numbers and ask ourselves if they meet the criteria. What is the criteria you ask? Watch. Practice this lesson yourself on K ...651 views

37) Partial quotient method of division  Multiplication and division  ArithmeticAn alternate to traditional long division676 views

38) Partial quotient method of division 2  Multiplication and division  ArithmeticAnother example of doing long division using the partial quotient method606 views

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