Numerical Progressions 
Numerical Progressions helps students search for deduced and induced relationships between separate objects or events. Students draw accurate conclusions regarding the rules and formulae of progressions as the instrument increases their ability to compare, infer, and reason deductively and inductively. This instrument mediates precision, discrimination, and a willingness to defer judgment until all of the elements have been worked out in determining a common rule for a progression. 
 Use of relevant tacit cues like index (the place of a number in the progression). 
 Finding relationships between the elements of the progression.