Multiplying and dividing monomials

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Model and calculate each multiplication.
1. $\left( {6x} \right)\left( {2x} \right)$
2. $\left( { - 4y} \right)\left( {3y} \right)$
3. $\left( x \right)\left( { - 5x} \right)$
4. $\left( { - 2x} \right)\left( {7x} \right)$
Multiply.
1. $\left( x \right)\left( { - 4x} \right)$
2. $\left( {5x} \right)\left( {3x} \right)$
3. $\left( { - 2x} \right)\left( { - 6x} \right)$
4. $\left( { - 3.1x} \right)\left( { - 4x} \right)$
5. $\left( { - \frac{3}{4}x} \right)\left( {16x} \right)$
6. $\left( { - 8x} \right)\left( {2.3y} \right)$
Divide.
1. $\frac{{144x}}{6}$
2. $\frac{{84xy}}{{4xy}}$
3. $\frac{{9{x^2}}}{x}$
4. $\frac{{18xy}}{{3x}}$
5. $\frac{9.6{p^2}}{ - 8p}$
6. $\frac{{ - 25x}}{{ - 5x}}$
Find the missing dimension.