Question

-3 over 8 - 1 over 10

A. 2 over 9
B. -19 over 40
C. -3 over 8
D, 19 over 40

Answer 1

Giving medal to whoever can answer this correctly!

Answer 2

Common denominator

Answer 3

How do I figure that out?

Answer 4

\[-\frac{3}{8} -\frac{1}{10} \\ \\ =-\frac{3}{8} (\frac{\times10}{\times 10})-\frac{1}{10} ( \frac{\times8}{\times8}) \\ \\ =\frac{-30-8}{80}\]

Answer 5

o_O

Answer 6

Im confused.:L

Answer 7

Well you just multiply whatever the other fraction's denominator to get the fractions together
\[-\frac{3}{\color{red}{8}} -\frac{1}{\color{blue}{10}}\]
\[(-\frac{3}{8} \times \color{blue}{\frac{10}{10}}) -(\frac{1}{10}\color{red}{\times \frac{8}{8}})\]
\[-\frac{30}{80} -\frac{8}{80}\]
\[\frac{-30-8}{80}\]
Then add -30 to -8

Answer 8

I got -38 :S

Answer 9

well positive 38

Answer 10

IM so dumb>.>

Answer 11

Negative, not positive

Answer 12

Oh so positive. so would it be 3 over 8?

Answer 13

Then find the common factor of -38 and 80, can you find it?

Answer 14

nope,

Answer 15

How would I find that?

Answer 16

You gotta find the number that, when -38 and 80 is divided by that number, you get a whole number. Try dividing 2 for both -38 and 80

Answer 17

Im not sure what you mean.:[

Answer 18

2 for both -38 and 80?

Answer 19

Yup

Answer 20

What do you mean by that?

Answer 21

-38 divide 2 you get -19
80 divide 2 you get 40

Answer 22

Ohhh.

Answer 23

Because you have to simplify it, by dividing 2 you're actually making the numbers smaller

Answer 24

I see. can you chck the answer to this problem? I got it just want to make sure it's correct.

Answer 25

ok

Answer 26

1.4 - 5.5 - 1.73 + 1.8 - 1.09
-5.12 is my answer. you've got to simplify.

Answer 27

That's correct

Answer 28

Thank You!:p

Answer 29

yw