Asked by Anonymous
What is the least common denominator when adding the fractions a / 2, b / 3, c / 9, and d / 15?
A. 45
B. 90
C. 135
D. 270
E. 810
A. 45
B. 90
C. 135
D. 270
E. 810
Answers
Answered by
Ms. Sue
Only three of those are divisible by 2.
Which one is also divisible by 3, 9, and 15?
Which one is also divisible by 3, 9, and 15?
Answered by
Anonymous
Will it be 90?
Answered by
Ms. Sue
Yes. 90 is correct.
Answered by
Anonymous
Because 2 x 9 x 15 = 90
Answered by
Ms. Sue
No.
Answered by
Anonymous
Oh. I apologize.
Answered by
Anonymous
2 x 9 x 5 = 90. I realized my mistake.
Answered by
Anonymous
I'm sorry. I don't know what I'm doing.
Answered by
Ms. Sue
Study this site carefully.
http://www.mathsisfun.com/least-common-denominator.html
http://www.mathsisfun.com/least-common-denominator.html
Answered by
Anonymous
2: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20
3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30
9: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90
15: 15, 30, 45, 60, 75, 90, 105, 120, 135, 150
so the LCD is 90
3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30
9: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90
15: 15, 30, 45, 60, 75, 90, 105, 120, 135, 150
so the LCD is 90
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