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Decimals Videos 6 videos

Converting Decimals
1956 Views

This video explains how to convert between decimals, percents, and fractions. All three of these languages are just different ways of showing parts...

Decimals (Spanish)
440 Views

Vamos directo al grano. "." Allí está. Saluda a la coma decimal, su nuevo mejor amigo. Ustedes se ir de compras juntos, pasar el rato en la playa...

Pre-Algebra: Adding and Subtracting Fractions and Decimals
6153 Views

Worried about adding and subtracting fractions? Never fear. It's so easy that it will only take up a fraction of your time: just use multiplication...

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ACT Math 3.1 Pre-Algebra 298 Views


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Description:

ACT Math: Pre-Algebra Drill 3, Problem 1. Calculate (0.3) 4 .

Language:
English Language

Transcript

00:03

Shmooper-califragilistic-mathialidocious...

00:07

Calculate: point-3 to the 4th power.

00:10

And here are the potential answers...

00:14

OK, so what's this exponent problem testing?

00:17

It's really all about the concept of multiplying numbers SMALLER than 1.

00:21

If we think about it -- and yeah, it may hurt...

00:25

...1 times 1 times 1... is always gonna be 1. That's why it's the loneliest number.

00:31

And if we multiply a number a bit bigger than 1 again and again and again like an infinite

00:37

number of times, our result will... also be infinite.

00:41

But if a number is SMALLER than 1 and we multiply it a bunch of times, it'll get closer and

00:48

closer to... zero.

00:49

In this case, we are multiplying less than a third of 1... so at the end of the day it

00:55

should be a really small number because we are multiplying it 4 times.

01:00

Just understanding this concept generally, we can get rid of B and D immediately... and

01:05

A as well, really.

01:07

But if we just brute force the math, we get point 3 times point 3 which is point ZERO

01:13

9.

01:14

There were TWO units to the right of the decimal -- here and here...

01:17

...so we need two units to the right of the decimal in our answer.

01:21

Now we multiply by .3 again and we have .027 -- yeah -- THREE numbers to the right of

01:27

the decimal.

01:28

Do it one last time and we have .0081... FOUR units to the right of the decimal.

01:34

So the answer is E.

01:35

As in, "Everybody's busy."

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