Fractions are used to represent some parts of a whole. In a fraction the denominator represents the total number of parts, whereas the numerator tells you a certain number of parts. Fractions could seem complex, but with some practice children can easily learn addition, subtraction and multiplication of fractions.
Learning fractions early on is important as advanced mathematical concepts like algebra become easy for your children if their fundamentals are strong. Here is a worksheet on addition of mixed fractions for 4th grade children. Mixed fractions are fractions which a whole number and a fraction are combined.