- Converting repeating decimals to fractions: video 1 - video 2
- Introduction to rational and irrational numbers | Algebra I | Khan Academy
- Intervals and interval notation | Functions | Algebra I | Khan Academy
- Simplifying square-roots. Khan Academy. Radicals | Pre-Algebra + Expressions
- Khan Academy - rationalizing the denominator
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- Rúbrica de corrección exposiciones.