Question

1/4-2/5+6/14

Answer 1

You need to find the LCD of 4, 5, and 14.

Answer 2

Or the LCM rather.

Answer 3

Can you show me the working

Answer 4

Do you know how to find the LCM?

Answer 5

is 2

Answer 6

The LCM of 4, 5, and 14 is not 2.

Answer 7

To find the LCM of a collection of small numbers it's a good idea to make a chart of the multiplicity of all the factors in your set.

Answer 8

So for example:

\[4 = 2^2\]\[5 = 5^1\]\[14 = 2^1\cdot 7^1\]

So we make a chart:
\begin{array}{|c|ccc}
Number & 2 & 5 & 7 \\ \hline
4 & 2 & 0 & 0 \\ \hline
5 & 0 & 1 & 0 \\ \hline
14 & 1 & 0 & 1
\end{array}

Then you take the product of the max multiplicity from each column to find the LCM:

\[LCM = 2^2 \cdot 5^1 \cdot 7^1 = 140 \]

Answer 9

so what is the answer, i got 0.28

Answer 10

Polpak please answer me

Answer 11

\[\ \ \ \frac{1}{4} - \frac{2}{5} + \frac{6}{14}\]\[=\frac{35}{140} - \frac{56}{140} + \frac{60}{140}\]\[=\frac{95 - 56}{140}\]\[=\frac{39}{140} \approx .27857\]

Answer 12

Thank you , you are a really master of maths

Answer 13

Polpak Thank you very much