The sum of the first 300 odd numbers is 90,000
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You square the number of integers you are looking for, in this case; 300. So, 300 squared = 300 x 300 = 90,000. Thus, the sum of the first 300 odd numbers is 90,000.
The sum of the first 40 odd numbers is 1,600.
The sum of the first 15 odd numbers is 225.
22,500. 1 + 299 = 300, 3 + 297 = 300, 5 + 295 = 300,…147 + 153 = 300, 149 + 151= 300. There are 75 odd numbers pairs from 1 to 299, and each odd number pair equals 300. The total is 75 x 300 = 22,500.
the sum of first 50 consecutive odd numbers is 9801