Find Numbers Where Unit Digit = 3 × Tens Digit: Place Value Challenge

To solve this problem, choose a number from the options where the unit digit is three times the tens digit:

• Option 1: $8642$
  Tens digit: $4$, Units digit: $2$.
  Units is not three times tens. Reject.
• Option 2: $5846$
  Tens digit: $4$, Units digit: $6$.
  Units is not three times tens. Reject.
• Option 3: $3257$
  Tens digit: $5$, Units digit: $7$.
  Units is not three times tens. Reject.
• Option 4: $1426$
  Tens digit: $2$, Units digit: $6$.
  Six is three times two. Accept.

Thus, the correct number in question is $1426$.