Question

9/4 - 7/10 i cant figure this out

Answer 1

9/4 - 7/10= 31/20=1 11/20

Explanation:

look first for their LCM=20

2 4 10

2 2 5

5 1 5

1 1

then you divide the LCM which is 20by one of the denominator and multiply by the numerator over denominator

20/4*9=45/20

20/10*7=14/20

now both have the same denominator so we just subtract the numerators

45-14/20=31/20

now we have subtracted and our answer is in improper fraction so we need to change to mixed fraction

31/20=1 11/20

Answer 2

The answer is 31/20.

Explanation:

First, you have to have both fractions the same denorminator :

`(9)/(4) - (7)/(10)`

`(9 * 5)/(4 * 5) - (7 * 2)/(10 * 2)`

`(45)/(20) - (14)/(20)`

Next, you have to subtract :

`(45)/(20) - (14)/(20)`

`(45 - 14)/(20)`

`(31)/(20)`