91Ó°ÊÓ

In the following exercises, divide.

$\frac{2}{5}÷\left(-10\right)$

In the following exercises, divide.

$-18÷-\left(\frac{9}{2}\right)$

In the following exercises, simplify.

$\frac{{\displaystyle \frac{2}{3}}}{{\displaystyle \frac{8}{9}}}$

In the following exercises, simplify.

$\frac{{\displaystyle \frac{4}{5}}}{{\displaystyle \frac{8}{15}}}$

In the following exercises, simplify.

$\frac{-{\displaystyle \frac{9}{10}}}{3}$

In the following exercises, simplify.

$\frac{2}{{\displaystyle \frac{5}{8}}}$

In the following exercises, simplify.

$\frac{{\displaystyle \frac{r}{5}}}{{\displaystyle \frac{s}{3}}}$

For the number $27,493,615,$ find the place value of each digit:

$\left(a\right)2\left(b\right)1\left(c\right)4\left(d\right)7\left(e\right)5$

In the following exercises, name each number using words.

$364,510$

Round $784,951$ to the nearest: a hundred b thousand c ten thousand.