A number of important changes took place over the 18 months.

A number of changes took place on 25 June 1958.

The number does not take into account lost business or other economic costs.

During the mid-1980s, a number of significant changes took place.

Since its construction a number of environmental changes have taken place.

A growing number of health plans have taken similar steps.

That is, a number takes the place of a letter.

A number of major events took place throughout the year.

A number of people took only a one or two week course.

A number of state and local governments have also taken action.