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.
In KS2 children are taught that decimals are another way of writing fractions. The hundred number square is a really good way of showing children the equivalence between fractions and decimals.