What is the sum of odd numbers from 8 to 146? Here we will show you step-by-step how to calculate the sum of odd numbers from 8 to 146.
Step 1) We start by finding the first (F) and last (L) odd numbers from 8 to 146. It is easy to do that by simply looking at the numbers. The first odd number is 9, and the last odd number is 145.
F = 9
L = 145
Step 2) Next, we calculate the total odd numbers (T) there are from 8 to 146, using a formula. Here is the formula and the math:
T = (L - F + 2) ÷ 2
T = (145 - 9 + 2) ÷ 2
T = 138 ÷ 2
T = 69
Step 3) Finally, we use the information from Step 1 and Step 2, and another formula, to calculate the sum of odd numbers from 8 to 146, like this:
Sum = (T ÷ 2) × (2 × F + (2 × (T - 1))
Sum = (69 ÷ 2) × (2 × 9 + (2 × (69 - 1))
Sum = 34.5 × (18 + 136)
Sum = 34.5 × 154
Sum = 5313
Sum of odd numbers from 8 to 146 = 5313
Sum of Odd Numbers Calculator
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