9 and 90
18 and 81
27 and 72
36 and 63
45 and 54
Chat with our AI personalities
The smallest two-digit composite number is 10, which is the product of 2 and 5. The largest two-digit composite number is 99, which is the product of 3 and 33. To find the sum of the smallest and largest two-digit composite numbers, we add 10 and 99, resulting in 109.
100
Well, darling, the sum of the first 99 odd numbers is 9801. You see, you take the last odd number, which is 197, multiply it by the total number of odd numbers (which is 99), and divide by 2. Voila! Math magic at its finest.
You need to add all the numbers from 10 to 99. You can do that quickly with the formula for an arithmetic series.
The numbers must average 33, so the answer is 32, 33 and 34.