Question

7x7+=49 and 2x8=16. .

Answer 1

Okay,
\(\LARGE\color{black}{ \frac{7}{8} - \frac{2}{7} }\) can you tell me the common denominator?

Answer 2

First, you have to find the least common multiple of 8 and 7.

Answer 3

@kalem03 What is the smallest number 8 and 7 go into?

Answer 4

the least common multiple is 56?

Answer 5

Yes!

Answer 6

So what number do you multiply to 8 to get 56?

Answer 7

\(\LARGE\color{black}{ \frac{7}{8} - \frac{2}{7} }\)

\(\LARGE\color{black}{ \frac{7\color{red}{\times 7}}{8\color{red}{\times 7}} - \frac{2\color{red}{\times 8}}{7\color{red}{\times 8}} }\)

Answer 8

o.o

Answer 9

notice, I am not changing any values. I am just multiplying top and bottom of each fraction.

\(\LARGE\color{black}{ \frac{7\color{red}{\times 7}}{8\color{red}{\times 7}} - \frac{2\color{red}{\times 8}}{7\color{red}{\times 8}} }\) (can you simplify this expression, like to multiply all the red numbers?)

Answer 10

Yeah, do what @SolomonZelman told you to do.

Answer 11

Since 8 x 7 = 56, you have to multiply 7 to the numerator too, and since 7 x 8 = 56, you have to multiply 8 to 2 also.

Answer 12

If you need any more help, reply....