How would i do this work out?

**Math Noob** · September 13th 2009, 08:48 AM

I need the break down on how to get the answer please.

8 21/22+3/4-5/12=?

The eight is a mix number with twenty one and twenty two

**VonNemo19** · September 13th 2009, 08:53 AM

Originally Posted by Math Noob

I need the break down on how to get the answer please.

8 21/22+3/4-5/12=?

The eight is a mix number with twenty one and twenty two

Im not sure what the 8 is doing there, but let's pretend that it isnt because the idea is the same.

You need to find a common denominator here...

Do you know how?

**Math Noob** · September 13th 2009, 08:56 AM

the eight is the whole number of 8 21/22

you have to multiply 22 by 8 and then add the 21 correct?

i got that part figured out now what's next? find the common denominator of each fraction?

**e^(i*pi)** · September 13th 2009, 08:58 AM

Originally Posted by Math Noob

I need the break down on how to get the answer please.

8 21/22+3/4-5/12=?

The eight is a mix number with twenty one and twenty two

$8\frac{21}{22} + \frac{3}{4} - \frac{5}{12}$

Find the LCM of 22, 4 and 12 which is 132 also that 8 can also be written as $\frac{8 \times 22}{22}$

**VonNemo19** · September 13th 2009, 08:58 AM

Originally Posted by Math Noob

the eight is the whole number of 8 21/22

you have to multiply 22 by 8 and then add the 21 correct?

Correct! Sorry that I didn't notice that, by the way. So we will have...

$\frac{176}{22}$

So, now what should we do? The common denominator, right.

**Math Noob** · September 13th 2009, 09:00 AM

how did you find the common denominator so fast?

**e^(i*pi)** · September 13th 2009, 09:02 AM

Originally Posted by Math Noob

how did you find the common denominator so fast?

Using prime factors.

22 = 2 x 11
12 = 2 x 2 x 3

Multiply any unique prime factors: 2 x 2 x 3 from 12 and 11 from 22:

$2 \times 2 \times 3 \times 11 = 132$

**VonNemo19** · September 13th 2009, 09:03 AM

Originally Posted by Math Noob

how did you find the common denominator so fast?

I will stand down now.

**Math Noob** · September 13th 2009, 09:08 AM

lol im still trying to figure it out

**Math Noob** · September 13th 2009, 09:11 AM

the answer is 9 19/66

**e^(i*pi)** · September 13th 2009, 09:12 AM

Originally Posted by Math Noob

lol im still trying to figure it out

$\frac{197}{22} + \frac{3}{4} - \frac{5}{12}$

As this does not ask for the LCM you don't need to use it - you can cross multiply if you wish

I don't see why you don't number crunch it?

**Math Noob** · September 13th 2009, 09:17 AM

because i am a noob, and would love to know how to number crunch

**e^(i*pi)** · September 13th 2009, 09:19 AM

By using a calculator and putting in the numbers

$\frac{197}{22} + \frac{9}{12} - \frac{5}{12}$

LCM is 132

$<br /> (\frac{197}{22} \times \frac{6}{6}) + (\frac{9}{12} \times \frac{11}{11}) - (\frac{5}{12} \times \frac{11}{11})$

$= \frac{1182}{132} + \frac{99}{132} - \frac{55}{132}$

$= \frac{1182+99-55}{132}$

which should give the answer

**Math Noob** · September 13th 2009, 09:21 AM

I have a ti-84 plus i just purchased, I'm trying to figure out how to use it.

**e^(i*pi)** · September 13th 2009, 09:23 AM

I edited my above post to include the answer

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