Two students are playing a math game. The object of the game is to make the least possible number by arranging the given digits inside value bars on a card. In the first round, each player will use the digits 3, 5 and 7 to fill in the card.

One student arranges the numbers on the card as shown. -7, 5. 3 what was the students mistake

Im not really sure

Based on the arrangement you provided (-7, 5, 3), it seems that the student's mistake is misplacing the negative sign ("-") in front of the number 7. In this case, the correct arrangement would be -7, 3, 5. The negative sign should come before the number it is associated with, not after it.

To clarify further, let's go through the steps to find the least possible number using the digits 3, 5, and 7:

1. Start by arranging the digits in ascending order: 3, 5, 7.
2. Since the question mentions arranging the digits inside value bars on a card, let's represent these digits in value bars: |3|, |5|, |7|.
3. To form the least possible number, we need to place the smallest digit in the leftmost value bar. So, we should start with |3|.
4. Next, we place the second smallest digit in the next value bar. Hence, we have |3|, |5|.
5. Finally, we place the largest digit in the last value bar, resulting in |3|, |5|, |7|.
6. Combining these value bars, we get the least possible number: 357.

Therefore, the correct arrangement should be -7, 3, 5, without misplacing the negative sign.