Evaluate $\frac{1}{4}\times\frac{9}{1}$14×91.
Evaluate $\frac{70}{1}\times\frac{1}{10}$701×110.
Evaluate $\frac{1}{12}\times\frac{1}{7}$112×17.
Evaluate $\frac{4}{3}\times\frac{1}{7}$43×17.
Multiply and divide fractions by fractions, using tools in various contexts.