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Q: What are the greatest and least 6-digit numbers in which the digit in the thousands place is twice the digit in the tens place?

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Greatest: 989949 Least: 100000

987654

999

In order to get the greatest number we want to try and get the biggest possible numbers in the hundred thousands, ten thousands and thousand places. There is no rule against the hundred thousands digit being 9 so it must be 9. The ten thousand digit needs to be twice the tens so it must be 8 while the tens is 4. The thousands digit is divided by the units, and the number is even. So thousands must be 6 and the units must be 2. Thus the hundreds must be 7. The number is 986,742

Add the two greatest possible four digit numbers. 9999 + 9999

smallest=1234 greatest=4321

Th e greatest 4-digit even number is 9,998 .

9998

998

998

It is: 97

3897

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