What is the sum of odd numbers from 10 to 110? Here we will show you step-by-step how to calculate the sum of odd numbers from 10 to 110.
Step 1) We start by finding the first (F) and last (L) odd numbers from 10 to 110. It is easy to do that by simply looking at the numbers. The first odd number is 11, and the last odd number is 109.
F = 11
L = 109
Step 2) Next, we calculate the total odd numbers (T) there are from 10 to 110, using a formula. Here is the formula and the math:
T = (L - F + 2) ÷ 2
T = (109 - 11 + 2) ÷ 2
T = 100 ÷ 2
T = 50
Step 3) Finally, we use the information from Step 1 and Step 2, and another formula, to calculate the sum of odd numbers from 10 to 110, like this:
Sum = (T ÷ 2) × (2 × F + (2 × (T - 1))
Sum = (50 ÷ 2) × (2 × 11 + (2 × (50 - 1))
Sum = 25 × (22 + 98)
Sum = 25 × 120
Sum = 3000
Sum of odd numbers from 10 to 110 = 3000
Sum of Odd Numbers Calculator
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