Author note — to cover

A negative integer index as the reciprocal of the positive power, e.g. 2 to the -3 is 1/8; why results are small, not negative; numeric bases only. Foundation and Higher both examine integer indices; fractional indices are Higher, on the later trio of pages. (N7)

• Fluency — direct questions on negative indices, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).