Online animation introduces the concept of addition and subtraction of common fractions. Math lesson also provides limited sample questions at the end of the topic.*4**4**1*ADDITION AND SUBTRACTION OF FRACTIONS*2*Demonstrates when adding or subtracting fractions with the same denominator, add or subtract the numerator - the denominator stays the same.*4*Demonstrates when adding or subtracting mixed numbers, first add or subtract the whole number then add or subtract the fraction.*4**4**4*Useful for teachers of maths.