You should really do math facts. My third grader (who does 5th grade math) really knows his math facts, and I can say I think third grade is when that really ramps up- for both multiplication and division. Kids really need addition and subtraction math facts too in second grade. Try doing some timed tests on those at home.
My experience from my fairly "math-y" kids is that addition and multiplication are very easy and subtraction (and division) are harder conceptually.