Step 1 of 4 · The rule
A digit's place matters most. The leftmost digit weighs the most.
GREATEST: put the BIGGEST digit on the LEFT, smallest on the right.
LEAST: put the SMALLEST digit on the LEFT (but never 0 if you can help it).
Step 2 of 4 · Digits: 2, 7, 5
Watch — sort big to small for the greatest, small to big for the least.
↓ greatest
↓ least
Step 3 of 4 · Digits: 1, 0, 5, 7 — careful!
There's a 0 in the mix. It can't lead the least number (else it'd just be 3 digits).
↓ greatest
↓ least
Greatest = 7510 (big → small). Least = 1057 — we move the smallest non-zero digit to the front so it's still a 4-digit number.
Step 4 of 4 · Your turn
Pick the answer.
🏆
Nice work!
You built them all.