XtraMath is a free web program that teaches addition, subtraction, multiplication and division facts which are critical to success in mathematics.

 Kindergarten K1K2 K3 K4 K5 K - 54 
 Grade 1 810 12 14 15 18 
 Grade 2 2728 31 32 34 35 
 Grade 3 45 47 4849 50 51
 Grade 4 36 40 41 42 43 44

Classroom Link                                      Misc.