# Interactive video lesson plan for: Simple interest - How to calculate it

#### Activity overview:

► My Algebra 2 course: https://www.kristakingmath.com/algebra-2-course

Simple interest is different than compounded, or compounding, interest. With compounding interest, you earn interest on your interest, so that your money grows exponentially. But with simple interest, you don’t earn interest on your interest, you only earn interest on your principal balance. Therefore, your money grows linearly.

0:06 // What is simple interest?
1:03 // The interest formula I=Prt
1:47 // First example: How to find the interest you earn in 2 years?
4:31 // Second example: How much will you have in total? And the amount formula A=P+I
7:28 // Third example: How much money will you have after 6 years?

In this video we’re going to talk about simple interest and how to calculate it. We’ll look at the formula to use to calculate interest, but we’ll also look at a formula that calculates how much money we’ll have in total in the future. The amount we’ll have in the future, as we’ll see, is just the amount of money we started with, plus all the interest we earned.

Which means we actually don’t really need a separate formula at all. As long as we know how to calculate interest, then we can simply add the interest amount to the principal amount that we started with, and we’ll get the total amount of money that we’ll have in the future.

Music by Joakim Karud: http://soundcloud.com/joakimkarud

● ● ● GET EXTRA HELP ● ● ●

If you could use some extra help with your math class, then check out my website // http://www.kristakingmath.com

● ● ● CONNECT WITH KRISTA ● ● ●

Hi, I’m Krista! I make math courses to keep you from banging your head against the wall. ;)

Math class was always so frustrating for me. I’d go to a class, spend hours on homework, and three days later have an “Ah-ha!” moment about how the problems worked that could have slashed my homework time in half. I’d think, “WHY didn’t my teacher just tell me this in the first place?!”

So I started tutoring to keep other people out of the same aggravating, time-sucking cycle. Since then, I’ve recorded tons of videos and written out cheat-sheet style notes and formula sheets to help every math student—from basic middle school classes to advanced college calculus—figure out what’s going on, understand the important concepts, and pass their classes, once and for all. Interested in getting help? Learn more here: http://www.kristakingmath.com

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Tagged under: simple interest,interest,compounding interest,compounded interest,principal amount,principal balance,interest rate, interest earn, account,money math

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