Answer
503
Work Step by Step
Ones place: Regroup. 10-7 = 3
Tens place: 7-7 = 0
Hundreds place: 5-0 = 5
Thousands place: 1-1 = 0
From the 0 in the thousands place, 5 in the hundreds place, 0 in the tens place, and 3 in the ones place, we get 503.