Puzzle 1: Which number replaces the
question mark?
Answer:1
Explanation: Reading each row as a 3 digit number, the rows
follow the sequence of square numbers, from 17 to 19.
Puzzle 2: Which number replaces the
question mark?
Answer: 6
Explanation: The number at the centre of each
segment equals the sum of the numbers on the outside of the opposite segment.
Puzzle 3: Which number replaces the
question mark?
Answer: 3
Explanation:
Working in rows, the number in the central oval
equals the sum of the left and right hand numbers, divided by 3.
Puzzle 4: Which number replaces the question mark?
Answer:
16
Explanation: Starting with the top left number, and working down one row at a time, alternating between left and right, double the number each time. Repeat this sequence, starting with the top right number.
Puzzle 5: Which number replaces the
question mark?
Answer:13
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