Addition is the foundation of arithmetic. If you practice the above-mentioned methods, it will improve your subtraction skills too. Apart from these methods, make use of math work books. Write down each number in the box and then use methods discussed above.
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.