num1

The choice when expressing numbers is between using a word to express the number (e.g., three) or a figure (e.g., 3).  Please check whether or not the number is expressed correctly.  Then  highlight the rule that governs the use of the number in this instance.

The purpose of this study was to examine the effects of two study techniques on learning of new material.

The expression of the number is   correct     incorrect       because: