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Oh, what a happy little question! The greatest 6-digit number where the digit in the thousands place is twice the digit in the tens place is 986,432. And the smallest 6-digit number following the same rule is 164,823. Isn't it wonderful how numbers can dance together in such a harmonious way?
It is 3823.
998,949 If the tens place was any other number, it would either be smaller then 4 x 2 = 8, or it would equal more then 10 in the thousands place.
3 more than 5 is 8, so the tens digit is 8. The tens digit is,double the number of the ones digit, so divide 8 by 2 and you get 4. If you double 4 it is 8 so, the number is 84.
The answer is 43 and the reason why the tens digit changes is because 7 + anything over 2 will change the digit. If just added 7 + 6 it would be 13 then add 30. 1 + any whole number over 8 will change the tens digit 2 + any whole number over 7 will change the tens digit 3 + any whole number over 6 will change the tens digit 4 + any whole number over 5 will change the tens digit 5 + any whole number over 4 will change the tens digit 6 + any whole number over 3 will change the tens digit 7 + any whole number over 2 will change the tens digit 8 + any whole number over 1 will change the tens digit 9+ any whole number over 0 will change the tens digit ect