someone please help. I suck at fractions.
2007-11-06 10:14:54 · 5 answers · asked by [jayjay] 1 in Science & Mathematics ➔ Mathematics
you have to find a common denominator for all of the fractions. for example, the first one that comes to mind is 30, all of those fractions can go into 30.
so you get
2/3=20/30 and 2/5=12/30 and 7/10=21/30
then add them together
20/30+12/30+21/30=53/30
2007-11-06 10:22:32 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Adding
The Common denominator for 3,5 & 10 is 30 so do the following
2/3 = 20/30
2/5= 12/30
7/10= 21/30
Subtracting
20/30 minus 12/30 = 8/30 and so on.
Add 20+12+21= 53
Divide by 30 (53/30) = 1 23/30
2007-11-06 18:28:21 · answer #2 · answered by SAD 2 · 0⤊ 0⤋
Find the lowest common denominator, in this case, of 3, 5 and 10, it would be 30, and multiply all the fractions till they have that denominator.
2/3 * 10/10 = 20/30, 2/5 * 6/6 = 12/30, 7/10 * 3/3 = 21/30
20/30 + 12/30 + 21/30 = (20 + 12 + 21)/30 = 53/30 or 1 23/30
2007-11-06 18:24:29 · answer #3 · answered by always_cynthia 2 · 0⤊ 0⤋
You must find the LCM (least common multiple) for 3, 5, and 10. This number is 30.
2/3 becomes 20/30.
2/5 becomes 12/30.
7/10 becomes 21/30.
20/30+12/30+21/30=53/30
53/30=1 23/30
2007-11-06 18:25:12 · answer #4 · answered by William H 4 · 0⤊ 0⤋
denominators: 3,5,10, common 30
2/3 = 20 /30
2/5 = 12 /30
7/10 = 21 /30
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sum = 53 /30 = 1 23/30
2/3 = [2(10)] / [3(10)] ... multiply top&bottom by 10
2/5 = [2(6)] / [5(6)] ... top/bottom times 6
7/10 = [7(3)] / [10(3)] ... both times 3
2007-11-06 18:22:46 · answer #5 · answered by Philo 7 · 0⤊ 0⤋