The chapter “Playing with Number” revolves around numbers which makes the chapter more interesting. Mathematics is a world of numbers where one can play with the numbers and can easily discover various analogies and relations of the numbers from the number line. A number is said to be in generalized form if it is expressed as the sum of the product of its digits with respective place values. For e.g.: 56 = 10 x 5 + 6, 37 = 10 x 3 + 7, 90 = 10 x 9 = 0, etc. The chapter also explains about deducing the divisibility test rules for a two or three-digit number expressed in the general form. Playing with Numbers Writing and understanding a 2 and 3 digit number in generalized form (100a + 10b + c, where a, b, c can be only digited 0-9) and engaging with various puzzles concerning this. Number puzzles and games. They are deducing the divisibility test rules of 2, 3, 5, 9, 10 for a two or three-digit number expressed in the general form.