What times what is 72 is the number of different factors that can be multiplied to make this large number. The most common three numbers that make up 72 are 36, 24 and 12. In addition to these there are many other numbers that can be multiplied to produce this number including 2 and 3.

To find the factors of a given Number you can either use the division method or the prime factorisation method. Both of these methods can lead to the same result, however finding the factors of a Number using the division method is much quicker. To calculate the factors of a Number using the division methods start by dividing it by the smallest prime Number, in this case 2 which gives you 36 as your quotient, then divide again and again until you get to 1 as your remainder.

The prime factorisation method is a little more time consuming as you have to go through each of the Numbers that can be divided by 2, 3, 4, 6, 8, 12, 16, 24, 28, 30, and 36. Once you know the prime Numbers of a given Number you can then use the multiplication table chart below to quickly multiply two Numbers and see if they equal to each other.

The Rule of 72 is an investment rule that states that it takes about nine years for an initial investment to double. The formula is derived from the number 72 being divided by the compound annual return of an investment, which yields the approximate number of years required to double the invested money (72 / 8 = 9). The Rule of 72 can also be used to help determine the approximate growth rate of a given stock or mutual fund.

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