Question

Find each sum or difference.

3/n - 3/10

Answer 1

okai i can help

Answer 2

whats your choices?

Answer 3

i dont know yet

Answer 4

To add or subtract fractions, you need a common denominator.
There are two denominators, n and 10.
What is the LCD of n and 10?

Answer 5

3

Answer 6

No.
3 is the numerator of both fractions.
We need the smallest factor that can be divided evenly by both n and 10.
That is what the LCD of n and 10 means.
The LCD is 10n

Answer 7

so 1

Answer 8

No.
1 divides evenly into n and 10, but then again, 1 divides evenly into every number.
You need it the other way around. What can you divide by both 10 and n evenly.
The answer is 10n
10n is the LCD of n and 10.
Now you need to find an equivalent fraction of each fraction with denominator 10n.

Answer 9

help