What is the sum of odd numbers from 4 to 26? Here we will show you step-by-step how to calculate the sum of odd numbers from 4 to 26.
Step 1) We start by finding the first (F) and last (L) odd numbers from 4 to 26. It is easy to do that by simply looking at the numbers. The first odd number is 5, and the last odd number is 25.
F = 5
L = 25
Step 2) Next, we calculate the total odd numbers (T) there are from 4 to 26, using a formula. Here is the formula and the math:
T = (L - F + 2) ÷ 2
T = (25 - 5 + 2) ÷ 2
T = 22 ÷ 2
T = 11
Step 3) Finally, we use the information from Step 1 and Step 2, and another formula, to calculate the sum of odd numbers from 4 to 26, like this:
Sum = (T ÷ 2) × (2 × F + (2 × (T - 1))
Sum = (11 ÷ 2) × (2 × 5 + (2 × (11 - 1))
Sum = 5.5 × (10 + 20)
Sum = 5.5 × 30
Sum = 165
Sum of odd numbers from 4 to 26 = 165
Sum of Odd Numbers Calculator
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