This mathematical challenge is a challenge that has left even the most experienced off side. In it you have to find the missing number in a number wheel… But it’s puzzling!
Look carefully at the picture. It is a circle that is divided into eight parts, each of which has a number. Clockwise, the order is: 3, 5, 7, 9, 9, 25, 49 and the last one is the missing number.
Can you solve this riddle?
Y? You’ve got it?
- If you’re still puzzled, the answer is: 81.
Why?
Well, to find the answer, it is essential to observe the opposites on the wheel. So, you can see that each number on the right is opposite its square power. That is, the result of multiplying by itself.
In this way, opposite 3 there is a 9, on the opposite side of 5 there is 25 and on the other side of 7 there is 49. So the number that remains to be completed is the result of 9 raised to the square, that is, 81 .
What do you think? Very difficult? Challenge your “smartest” friend!
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