Which number should be subtracted from $\frac{16}{15}$ to get $\left(-\frac{16}{15}\right)$?

What should to subtracted from $\frac{7}{8}$ to get $1 ?$.

Subtract $\frac{9}{16}$ from the sum of $\frac{3}{4} \& \frac{5}{8}$.

If $x=\frac{-5}{7}, y=\frac{1}{12}, z=\frac{3}{4}$, check that $\left(x-y\right)-z\ne x-\left(y-z\right)$.

The product of a negative rational number with its multiplicative inverse is $-1$.

Do you agree? Give examples to support your answer.

Simplify:

$\frac{-8}{9}\times (\frac{3}{7}+\frac{7}{4})$

Find the value of $\frac{16}{9}\times \frac{3}{8}+\frac{14}{15}\times \left(\frac{-3}{7}\right)$

Simplify:

$\frac{-6}{16}\times \frac{8}{9}$