Problem 1 · 2023 Math Kangaroo
Easy
Spatial & Visual Reasoning
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Holger writes the numbers up to 40 into the table in the same way as shown. Which of the pieces A to E can he then cut out from the table?
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Answer: C
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Hint 1 of 2
The numbers fill the table eight to a row: 1-8, then 9-16, then 17-24, and so on.
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Hint 2 of 2
Pin down where 12 sits, then check that the two cells just below it really hold 20 and 21, and that the cell hanging beneath them matches the piece's shape.
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Approach: locate the cells by their row-of-eight positions and match the exact shape
- Each row holds eight numbers, so 12 sits in the second row, fourth column.
- Directly under 12 are 20 then 21 (third row), and beneath 21 sits 29 (fourth row).
- The piece whose three cells read 12 on top, 20 and 21 in the middle, and 29 hanging under the 21 is the only one whose outline matches these real positions.
- That is piece C.
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