Every number ending with either 1, 3, 5, 7, or 9
1, 3, 5, 7, 9, 11, 13, 15, 17, 19... 199
7,268
201
201
200*50=10000
The sum of all odd numbers 1 through 99 is 9,801.
200
The sum of all the numbers 1 through 200 is 20,100.
To determine the number of odd numbers between 100 and 200, we need to consider that odd numbers are integers that are not divisible by 2. The first odd number in this range is 101, and the last odd number is 199. To find the total count, we can subtract the first odd number from the last odd number and divide by 2, then add 1 to include both endpoints. So, (199 - 101) / 2 + 1 = 50 odd numbers.
First odd number greater than 20 is 21 Last odd number less than 200 is 199 → number of odd numbers between 20 and 200 is (199 - 21) ÷ 2 + 1 = 90
The sum of all the odd numbers from 1 through 100 is 10,000
100
201