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  • A square made of four rows of numbers, joined in ascending order. The rows are: 1, 2, 3, 4; 8, 7, 6, 5; 9, 10, 11, 12; 16, 15, 14, 13.
  • A square made of four rows of numbers, joined in ascending order. The rows are: 1, 2, 3, 4; 12, 13, 14, 5; 11, 16, 15, 6; 10, 9, 8, 7.
  • A square made of four rows of numbers, joined in ascending order. The rows are: 16, 15, 14, 13; 5, 4, 3, 12; 6, 1, 2, 11; 7, 8, 9, 10.
  • A square made of four rows of numbers, joined in ascending order. The rows are: 1, 2, 9, 10; 4, 3, 8, 11; 5, 6, 7, 12; 16, 15, 14, 13.
  • The numbers 3, 6, 30, 90, linked by 'chains' that each read 'Factor | Multiple'
  • The following numbers in a circle: 14, 2, 7, 9, 16, 20, 29, 35, 14.
  • First six rows of Pascal's triangle. The seventh row says '1, 6, 15, ?, ?, ?, ?'. The eighth row is blank.
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