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Could it be a square

Exercise and reference answers

Upper category
POSSIBLE
Lower category
NEVER
Items
  1. Category
    POSSIBLE
    Item
    Ends in 6
  2. Category
    NEVER
    Item
    Ends in 7
  3. Category
    POSSIBLE
    Item
    Ends in 1
  4. Category
    NEVER
    Item
    Ends in 8
  5. Category
    POSSIBLE
    Item
    Ends in 5
  6. Category
    NEVER
    Item
    Ends in 3
Instructions
Flip the points: can a square number end in this digit?

Explanation

_Source: syllabus Mathematics, 'Squares and Square Roots' (hemh105)_
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