If you have to use fractions, then

turn them both into fractions

13 7/10 = (13*10+7)/10 = 137/10

11 = (11*10)/10= 110/10

(137 – 110) / 10 = 27 / 10

27 / 10 = 2 7/10

Otherwise, just subtact the whole numbers

13 7/10 – 11 = 13-11 +7/10 = 2 7/10

10(13)+7=130+7=137 so it becomes 137/10-11

Next, you need to make 11 into a fraction – you do this by putting it over 1:

137/10-11/1

Now, you need to make both fractions have the same denominator. The easiest way to do this in this case is to multiply your 11/1 by 10/10 giving you:

110/10 which becomes 137/10-110/10

Now you can think of your equation as:

(137-110)/10

Do the subtraction contained in the numerator, and then put the fraction into simplest forms (which includes putting it back into a mixed numeral, if needed):

27/10 = 2 7/10

1. Change 13 7/10 into a simpler fraction: 137/10 (13×10+7 over 10)

2. Change 11 into a fraction: 110/10

3. Then substract 110/10 from 137/10

4. You should get 27/10, which simplifies into 2 7/10

13 7/10

– 10 10/10

________

the reason why i said 10/10 is to make the denominators equal. now, i have to make it so that the top is bigger, so you make that whole number (13) and subtract 1 (12) and add the denominator to the numerator (10+1= 17/10) looking like this:

12 17/10

– 10 10/10

_________

then, you simply subtract, getting 2 7/10.

is this is the problem:13 7/10 -11?

if it is then:

you just subtract whole numbers.

13-11 then add the fraction

so answer would be 2 7/10

then change the one to a 10 becuase you need common denominators

then times the 7 by 10

now subtract the 11 from the 70

and then put the 13 next to your answer.

if it needs to be turned into a proper fraction, then divide the numerator by the denominator

Just convert it to a decimal. Like, 13 and 7/10 equals 13.7 . So do 13.7 – 11, and you get 2!

Hersyrans:

tk11fm13lvstwthnyuhv7/10tosoths27/10

Perhaps your teacher will be able to read that and give you credit for knowing how to go to Yahoo!Answers.