What is the sum of odd numbers from 72 to 169? Here we will show you step-by-step how to calculate the sum of odd numbers from 72 to 169.
Step 1) We start by finding the first (F) and last (L) odd numbers from 72 to 169. It is easy to do that by simply looking at the numbers. The first odd number is 73, and the last odd number is 169.
F = 73
L = 169
Step 2) Next, we calculate the total odd numbers (T) there are from 72 to 169, using a formula. Here is the formula and the math:
T = (L - F + 2) ÷ 2
T = (169 - 73 + 2) ÷ 2
T = 98 ÷ 2
T = 49
Step 3) Finally, we use the information from Step 1 and Step 2, and another formula, to calculate the sum of odd numbers from 72 to 169, like this:
Sum = (T ÷ 2) × (2 × F + (2 × (T - 1))
Sum = (49 ÷ 2) × (2 × 73 + (2 × (49 - 1))
Sum = 24.5 × (146 + 96)
Sum = 24.5 × 242
Sum = 5929
Sum of odd numbers from 72 to 169 = 5929
Sum of Odd Numbers Calculator
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