Count on by hundreds from 200 to 900.
200, 300, 400, 500, 600, 700, 800, 900
Count backward by hundreds from 800 to 100.
800, 700, 600, 500, 400, 300, 200, 100
What is 50 more than 100?
100 + 50 = 150
What's 50 less than 300?
200 - 50 = 150
