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Playlist Fractions and Decimals 14 videos

1
Pre-Algebra: Adding and Subtracting Fractions and Decimals
6156 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...

2
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...

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Multiplying Fractions and Mixed Numbers Example 4903 Views


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Transcript

00:00

Thank you We sneak And here's your shmoop du jour

00:06

Which of the following is equivalent to sixty four times

00:09

one Thirty second to the fourth time's one sixteen to

00:13

the fifth And here the potential answers Okay so even

00:20

if we didn't recognize that each of these numbers is

00:22

a multiple of to we could have glanced at the

00:25

answer choices and glean that fact real fast In these

00:28

kinds of questions were almost always being asked to convert

00:31

to powers of two in this questions No exception So

00:35

we just convert everything to powers of two and rewrite

00:37

it It will hurt a bit but the hard work

00:39

is good for us Yeah feel the burn sixty for

00:43

is two times two times two times two times two

00:46

times two or two to the sixth Thirty two is

00:49

to the fifth and sixteen is two to fourth Problem

00:52

now looks like this Note also that when we have

00:57

exponents in the denominator we can rewrite them is negative

01:00

numbers so let's rewrite the problem to account for the

01:03

fractions Get rid of them like their unwanted body fat

01:06

And now we have a fully re written problem that

01:08

looks like this First we multiply the exponents that are

01:13

being raised to another power like this and once we

01:17

do that we can add and subtract the exponents like

01:20

this six minus twenty minus twenty which is negative thirty

01:24

four and woot There we go it's answer Be hope 00:01:28.581 --> [endTime] you remembered to stretch first

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