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
Answered by Ms. Sue
Only three of those are divisible by 2.

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
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
There are no AI answers yet. The ability to request AI answers is coming soon!