Rational and irrational numbers | Algebra I | Khan Academy (English)

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Rational and irrational numbers | Algebra I | Khan Academy
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Lecture 1: Sum and product of rational numbers

Lecture 2: Proof that rational times irrational is irrational

Lecture 3: Proof that square root of prime number is irrational

Lecture 4: Introduction to rational and irrational numbers

Lecture 5: Recognizing rational and irrational numbers (examples)

Lecture 6: Recognizing rational and irrational expressions example

Lecture 7: Proof that there is an irrational number between any two rational numbers

Lecture 8: Proof that square root of 2 is irrational

Lecture 9: Proof that sum of rational and irrational is irrational