Second Grade Challenging Math 
231) What is the time difference between 6:40 am and 10:40 am on the same day? 232) What is the time difference between 5:15 am and 10:23 am on the same day?
233) There are 17 birds on a tree. One was shot by a hunter. How many birds are left on the tree?
234) Inspect the following patterns. How many circles should there be in the 4^{th} group?
1 2 3
235) Today is Monday. What day of the week is 15 days from today?
More challenging math problems for 2nd grade:
15 610 1115
1620
2125
2630
3135
3640
4145
4650
5160
6170
7180
