For practicing some math skills like simple addition, there is just nothing more effective than a pencil and paper. These math worksheets start with simple addition (one-digit) math facts and progress to adding 2-digit numbers in columns. No regrouping is included in out grade 1 exercises.
Once students have a basic familiarity with fractions, the next step is to understand how to compare fractions. Sometimes the concept of denominators takes a little time to grasp. Often students will confuse a larger denominator with a larger value for the fraction, when in reality the numerator, not the denominator, expressed the actual value being represented. The size of the numerator relative to the denominator is what ultimately describes the actual value of the fraction.