place+value

5409 + 10 = 5419 5409 + 1000 = 6409 5409 + 1 = 5410 5409 + 100 = 5509 5409 + 1599 = 7008 5409 + 1689 = 7098 5409 + 2589 = 7998 5409 + 1590 = 6999