99 groups of 9, or, 9 groups of 99 are 891
To make five nines equal 100, you can use basic mathematical operations. One way to achieve this is by adding the five nines together: 9 + 9 + 9 + 9 + 9 = 45. Then, you can multiply this result by 2: 45 x 2 = 90. Finally, add 10 to 90 to reach 100: 90 + 10 = 100.
Multiples of 9 are numbers that can be divided by 9 without leaving a remainder. They follow a pattern of increasing by 9 each time. The first few multiples of 9 are 9, 18, 27, 36, 45, and so on. In general, the multiples of 9 can be represented as 9n, where n is a positive integer.