100 more and 100 less
100 more than 200 is?
300
10 more than 20 is?
30
100 less than 300 is?
200
10 less than 50 is?
40
100 more than 800 is?
900
10 more than 90 is?
100
100 less than 700 is?
600
10 less than 70 is?
60
100 more than 900 is?
1000
10 more than 100 is?
110