http://www.ixl.com/math/grade/second/

You can work 20 problems a day for free without joining, but you cannot access the games or get reports.  Your child's work will not be saved.  I liked this site because it provided pictures of base ten blocks for the place value activities.  Don't forget to let your child use the paper base ten blocks for the addition and subtraction, if they need them.

Use this site to
*  practice movement of the hands on the clock
*  practice reading an analog clock
*  practice elapsed time
         "What time will it be in 2 hours?"
         "We left at 2:30 and we did not get there until
               4:30.  How long was the trip?"

IXL

You can work 20 problems a day for free without joining, but you cannot access the games or get reports.  Your child's work will not be saved.  I liked this site because it provided pictures of base ten blocks for the place value activities.  Don't forget to let your child use the paper base ten blocks for the addition and subtraction, if they need them.