2178
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The number is 21978. 21978 when multiplied by 4 which gives the result 87912 which is in reverse order.
44444
In the number 680, the 6 digit is in the tens place. The tens place represents the value of the digit multiplied by 10. Therefore, the value of the 6 digit in 680 is 6 multiplied by 10, which equals 60.
Find a four digit number whose digits will be reversed when multiplied by nine?
It is 99. 99*99 = 9801