You arrange the numbers from highest to lowest, so the answer is 974.
8643
531
The highest number you can make out of the digits 2 4 0 and 1 is 4210.
974
get the numbers and order them from biggest to smallest.
9531
87531
8,764,320
Assuming each digit only once: 65432 (and no further mathematical operations).
The biggest number that can be made by arranging the digits is 951. However, 9^51 is a little under 5 trillion trillion trillion trillion, much larger than 951.
What is the largest number you can make from the digits 8,6,9,1 explain how you make the number
Truncation is an operation whereby a long decimal representation of a number is stopped after a given number of digits, taking no account of the digit which follows. This is different from rounding where the final digit retained may be increased by 1 if the following digits make a number which is greater than half a unit.