You will learn about "Introduction to Fractions" in this video. Look at this pizza. It is a whole. Now, divide it into 6 equal parts. One out of these six parts can be expressed as one upon six. This number is read as one sixth. Two out of six parts can be expressed as two upon six and read as two sixth. Such type of numbers are called fractions.
They express a part of a whole. Fractions can be written using two whole numbers and a line. Number above the line is called numerator and number below the line is called denominator. Denominator tells us total number of parts of a whole and numerator tells us how many parts are taken from the whole. Remember that, in a fraction, the denominator cannot be zero because we cannot make zero parts of a whole.