# Simplifying Square Roots | Exponents, Radicals, And Scientific Notation | Pre-Algebra | Khan Academy

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Pre-Algebra on Khan Academy: No way, this isn’t your run of the mill arithmetic. This is Pre-algebra. You’re about to play with the professionals. Think of pre-algebra 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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## 13 thoughts

1. Pinga Patrol says:

wat.

2. Þorleifr jarlsskál says:

5>117 And 15>13 give a different answer? Why?

3. himanshu singh says:

thnxccs khen akdimy

4. HitStep08 says:

Wow.. that adding the numbers trick is really cool!

5. Jonic_P says:

Does anyone know where I can find that video with the adding numbers trick????

6. The Noodle says:

1980

7. The Noodle says:

1. 9. 8. 0.

8. AudeTheOdd Pew says:

you have been helping me since 4th grade. (I am in 8th grade now) you are a great help

9. Sayal Kc says:

nice

10. RandomGamer &Christian says:

I still didn’t get it

11. GayLubeOil says:

you explain how but you dont explain how to do it in an effective way. I mean who the fuck would write out all of that out to answer every question?

12. sai pranay says:

How to find no. of non perfect square between n square and n+1square

13. Scientific Machine says:

Sadly real homework consist of problems far more difficult than this easy example.