place+value

5409 + 10 = 5419 5409 +1,000 = 6409 5409 +1 = 5410 5409 + 100 = 5509 5409 + 1,591 = 7008 5409 + 2,689 = 7098 5409 + = 7998 5409 +1,590 _ = 6999