19 FACTORA factor of a number is an exact divisor of that number i.e. the factor leaves remainder 0 when it divides the number.
20 4 × 5 = 204 and 5 are factors of 20. We can also say that 20 is multiple of 4 and 5.In 2 × 12 = 24,2 and 12 are factors of 24.24 is the multiple of 2 and 12.So, a number is a multiple of its factors.
21 The number of multiples of a given number is infinite.
22 FACTORS OF SOME NUMBERS 8 = 1,2,4,816 = 1,2,4,8,1625 = 1,5,25
24 POINTS TO REMEMBER 1 is a factor of every number. Every factor of a number is an exact divisor of that number.Every factor is less than or equal to the given number.Number of factors of a given number are finite.
25 POINTS TO REMEMBER contd Every multiple of a number is greater than or equal to that number.The number of multiples of a given number is infinite.Every number is a multiple of itself.
26 FACTOR OR MULTIPLE?For each of numbers in the statements, select either multiple [M] or factor [F]34 × = 170[F] [M] [F] [M] [F] [M]25 × = 10090 × = 90045 × = 2707 × = 210
27 State whether the following statements are TRUE or FALSE 1. 1 is a factor of every number. F T2. The largest factor of any number is the number itself. F T3. Number of factors of a given number is infinite. F T4.The number of multiples of 5 is 10. F T5.The factors of 65 are 1, 5 and 13 only. F T( Click ‘F’ for false and ‘T’ for true )