Helen the hippo and her friends are preparing for thanksgiving at Helen's house. Helen baked 42 chocolate chip cookies and 18 raisin cookies yesterday. And she baked 2 raisin cookies and 13 chocolate chip cookies this morning. How many more chocolate chip cookies did Helen bake yesterday compared to today?
1. How many chocolate chip cookies did Helen bake yesterday? 
42 
2. How many chocolate chip cookies did Helen bake today? 
13 
3. How many more chocolate chip cookies did Helen bake yesterday compared to today? 
42 - 13 = 29