Help me!!
2006-11-01 09:26:34 · 10 answers · asked by Kasey H 1 in Science & Mathematics ➔ Mathematics
The LCD is 40:
(7/10*4/4)-(7/8*5/5)
28/40-35/40=-7/40
2006-11-01 09:31:59 · answer #1 · answered by Anonymous · 5⤊ 0⤋
The easiest and the only way for all this is to make the denominator equal if you remember to take the least common factor...
The only common factor for 10 and 8 is 80. While making the denominator common we have to multiply the numerator also by the same number.
Thus,
[(7 x 8) / (10 x 8)] - [(7 x 10) / (8 x 10)]
[56 / 80 ] - [70 / 80]
Since the enominators are same we can equate the numerators like,
[56-70] / 80
-14 / 80
2006-11-01 17:44:32 · answer #2 · answered by Sindhoor 2 · 0⤊ 0⤋
7/10 - 7/8 = 28/40 - 35/40 = -7/40
2006-11-01 17:30:52 · answer #3 · answered by Anonymous · 1⤊ 0⤋
7/10 - 7/8 =
(28 - 35) / 40 =
- 7/40 Answer
2006-11-01 17:33:49 · answer #4 · answered by zahbudar 6 · 0⤊ 0⤋
take LCM of 10 and 8 which is 40
then multiply and divide with the no. of which it is divisible with
(7*4 - 7*5)/40
(28-35)/40=-7/40
2006-11-01 17:31:30 · answer #5 · answered by Anonymous · 1⤊ 0⤋
7/10 - 7/8 = 56/80 - 70/80 = -14/80 = -7/40
2006-11-01 17:29:08 · answer #6 · answered by KEiKo 3 · 1⤊ 0⤋
(7 / 10) - (7 / 8) = -0.175
OR
find a common denominator. Lets try 80
7/10 = 56/80
7/8 = 70/80
then subtract
56/80 - 70/80 = -14/80
reduce
-7/40
2006-11-01 17:28:33 · answer #7 · answered by DanE 7 · 2⤊ 0⤋
7/10 - 7/8 = 28/40 - 35/40 = -7/40
QED
2006-11-01 17:30:54 · answer #8 · answered by CSUFGrad2006 5 · 1⤊ 0⤋
-7/40
2006-11-01 17:29:00 · answer #9 · answered by Anonymous · 1⤊ 0⤋
-0.175
2006-11-01 17:31:10 · answer #10 · answered by Leo 4 · 1⤊ 0⤋