Are these 5 math questions right?

Question

9/13 - 5/13=4/13

11/15 - 7/15= 4/11

7/12 - 3/8=4/24=1/6

9/10 - 2/5= 7/30

3/8 - 1/6= 2/24 = 1/12

Answer 1

11/15-7/15=4/15

7/12-3/8=
14/24-9/24=5/24

9/10-2/5=
9/10-4/10=5/10=1/2

3/8-1/6=
9/24-4/24=5/24

Answer 2

No, you need to make a common denominator by multiplying the bottom AND top by the same number. It looks like you're just multiplying the bottom. That changes the number, you can't do that. But multiplying any number by 1 does not change it. 30 x 1 = 30. 10101 x 1 = 10101. 4/7 x 1 = 4/7.

So when you multiply the top AND bottom by the same number (i.e. 5/5), you are essentially multiplying by 1 (5/5 = 1....99/99 = 1....-2/-2=1).

For the third question, the lowest common denominator = 24. This requires the first fraction to be multiplied by 2 on the numerator and denominator. Which gives 14/24. Then the second fraction requires multiplication of 3 on the numerator and denominator. This gives 9/24. Now you can perform subtraction, and the answer is 5/24.

Do the same with the rest.

Answer 3

First two are correct

7/12 - 3/8= 14/24 -9/24 =5/24 ( Lcm of 8,12 equals 24)

9/10 - 2/5= 9/10-4/10 =5/10 = 1/2 ( Lcm of 10,5 equals 10)

3/8 - 1/6= 2/24 = 9/24-4/24 =5/24 ( Lcm of 8,6 equals 24)

Answer 4

the first two are right , the last 2 are wrong. A tip: don't overcomplicate , remember to look for the lowest numbers that you can multiply each denominator by to get the same denominator for both. ( For example, on #4, your first number already has 10 on the bottom (denominator) so just multiply the top and bottom of the next fraction by 2 and now both fractions have 10. Then its just 9-4=5 , so your answer is 5/10 or just simplified to 1/2. ( That one was a gimme, good luck on the others. Hope this helped.)

Answer 5

Not yet.
7/12-3/8 = 5/24

9/10 - 2/5 = 1/2

3/8 - 1/6 = 5/24

Answer 6

the third one is 5/24
14/24-9/24=5/s4
the fourth is suppose to be 1/2
9/10-4/5=5/10=1/2
the fifth is 5/24 again
9/24-4/24=5/24
you change the denometer but you forget to change the numerator

Answer 7

You got the first two right. Try the last three again. I used to hate fractions! Just make sure when you find a common denominator to multiply the numerator by the same number you multiplied the denominator. Good luck!

Answer 8

Im pretty sure they're all wrong except for the first one.

But then again I'm just doing these in my head.

Answer 9

Numero 4 is wrong.

Answer 10

Uh... no, you got the first two right. Try again.