If you do not understand the common basics of algebra then you will literally be lost forever when it comes to this subject. Being lost in the early stages of algebra can be disastrous because there are many years of advanced algebra just knocking on your door. Once you become more confident and your comfort level increases, you can actually strengthen it by trying to apply simple algebraic applications to everyday life. You will soon find out that algebra is not quite as difficult as you may have once thought.
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.