PDF chapter test TRY NOW
1. Put three different numbers in the circles, so that when you add the numbers at the end of each line, you always get a perfect square.
The three numbers are, and .
2. A three digit perfect square is such that if it is viewed upside down, the number seen is also a perfect square. What is the number?
[Hint: The digits \(1\), \(0\) and \(8\) stay the same when viewed upside down, whereas \(9\) becomes \(6\) and \(6\) becomes \(9\).]
The required number is
3. \(13\) and \(31\) is a strange pair of numbers such that their squares \(169\) and \(961\) are also mirror images of each other. Can you find two other such pairs?
The mirror image of the square number is .
Answer variants:
\(169\)
\(6\)
\(30\)
\(19\)
\(144\)
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