2/3 = 16/24

3/8 = 9/24

5/12 = 10/24

Add just the numerators, keeping 24 as the denominator:

16 + 9 + 10 = 35

So you have 35/24 which is improper. Divide to get a mixed number: 1and11/24.

For the subraction problem, you will have to get a common denominator as well, and borrow as necessary:

7 and 4/5 = 7 and 12/15

To subtract this from 18 and 6/15, you need to borrow. The 18 goes to 17, and when you add 1 to 6/15 you get 21/15.

Now you can subtract:

first the whole numbers, 17 – 7 = 10

now the fractions, 21/15- 12/15 = 9/15 (reduce to 3/5)

final answer: 10 and 3/5

that’s it!

change the three fractions so that all 3 have a common denominator. in this case, let the common denominator be 24. (coz 24 is the least common product value of the 3 numbers…ie 3, 8 and 12)

for 2/3, multiply both the numerator and denominator by 8.

= (2*8) / (3*8)

= 16 / 24

for 3/8, multiply both the numerator and denominator by 3.

= (3*3) / (8*3)

= 9 / 24

for 5/12, multiply both the numerator and denominator by 2.

= (5*2) / (12*2)

= 10 / 24

now that u have all the 3 fractions with the common denominator (24), add the numerator arithmetically.

= (16+9+10) / 24

= 35 / 24

= 1 and 11/24.

SUBTRACTION:-

7 and 4/5

= (7*5+4)/5

= 39/5

18 and 6/15

= (18*15+6)/15

= 276/15

Similarly, change the 1st fraction so that it has a common denominator as the other. in this case, let the common denominator be 15.

for 39/5, multiply both the numerator and denominator by 3.

= (39*3) / (5*3)

= 117 / 15

Now that u have both fractions with the common denominator (15), subtract the second fraction from the first.

= (117-276) / 15

= -159 / 15

= -10 and 3/5

That is a wholenumber into which the lower (division numbers) will divide.

2/3 + 3/8 + 5/12 = ?

Common denominator is 24

2/3 + 3/8 + 5/12 = (10 + 16 + 9)/24 = 35/24 = 1 11/24

7 4/5 – 18 6/15 = ?

Common denominator is 15

7 12/15 – 18 6/15 = -9 -6/15 = 8 and 9/15

Hope it helps Years since I did this stuff – took me ages to remember

3/8=9/24

5/12=10/24

equals 35/24 or 1 11/24

7 4/5 -18 6/15

is like

18 6/15 – 7 4/5= 11 3/5 but then that the answer is -11 3/5

7 4/5 = 39/5

18 6/15 = 18 2/5 = 92/5

39/5 – 92/5 = -53/5 = -10 3/5

Hope this helps.

16/24 + 9/24 + 10/24 and it equals 35/24 wich is 1 and 11/24 as a mixed fraction if you need it .

the second is sorta confusing so yea…