Students should spend at least 45 minutes per week actively learning on Khan Academy.
We recommend starting at your grade level and doing 1-2 practice sets per day (or 10 practice sets per week). This should take about 10-20 minutes per day. If you find it difficult, completely okay to start at an earlier grade level.
As you practice skills and answer questions, your mastery level for each skill will go up, if you answered correctly, or down, if you miss questions. If you want to make progress more quickly, try a Mastery challenge. Mastery challenges allow you to strengthen the skills you've already practiced in just six questions.
That's a total of about 120 hours. There are virtually no exercises and no mastery challenges. So, most of your time will be spent on the videos. Your total time will depend on how fast you understand the work and how many videos you have to repeat, etc.
The answer is yes! Khan Academy math lessons can absolutely be used as a full homeschool math curriculum.
Yes, Khan Academy is good for learning math. But a student shouldn't just use Khan Academy on its own. There's more to learning math that a student won't find on Khan Academy. Learning math, being truly proficient in it, takes five major components, according to the Adding it up: Helping Children Learn Mathematics.
Khan Academy is best used as a supplement to your normal schooling, whether that is homeschooling or a traditional school. The only certificates available on Khan Academy are: Teacher training certificates. Learnstorm certificates.
Use of Khan Academy was positively associated with better than predicted test scores, lower math anxiety, and higher confidence in one's ability to do math. SRI International conducted a two-year study with 20 public, private, and charter schools; 70 teachers; and 2000 students during the 2012-13 school year.
Trusted content. Created by experts, Khan Academy's library of trusted, standards-aligned practice and lessons covers math K-12 through early college, grammar, science, history, AP®, SAT®, and more. It's all free for learners and teachers.
As a general rule, for every 1 hour, you spend in class, you will spend 3 hours out of class studying / reviewing what you have learned. Therefore, to learn math from zero (1st grade) through 12th grade, you will need 10,320 hours to study math.
You could definitely teach Algebra I to yourself in under a year, but Algebra II will take a while. You can learn it as fast as you can watch the tutorials on you tube, it shouldn't take longer than 1 month to complete all the algebra you need for college.
In high school it usually takes 2–3 years. In college it usually takes 3 semesters, which is 1–2 years. Some people have to retake the class over and over again, which would result in them taking longer. If you know trig and calculus, you can pick up within six months if you work really hard for it.