6th puzzle by Dr Harry Wiggins (Reverse fun)
Did you know 2178 x 4 = 8712?
Find all ten-digit numbers which becomes 9 times bigger if the order of the digits is reversed.
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2019 NSW: Maths Puzzle 6
03
Aug
2019
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1099999989 x 9 =9899999901
However there is a second 10-digit number with this property. Who can find the second one?