What is the sum of odd numbers from 6 to 69? Here we will show you step-by-step how to calculate the sum of odd numbers from 6 to 69.
Step 1) We start by finding the first (F) and last (L) odd numbers from 6 to 69. It is easy to do that by simply looking at the numbers. The first odd number is 7, and the last odd number is 69.
F = 7
L = 69
Step 2) Next, we calculate the total odd numbers (T) there are from 6 to 69, using a formula. Here is the formula and the math:
T = (L - F + 2) ÷ 2
T = (69 - 7 + 2) ÷ 2
T = 64 ÷ 2
T = 32
Step 3) Finally, we use the information from Step 1 and Step 2, and another formula, to calculate the sum of odd numbers from 6 to 69, like this:
Sum = (T ÷ 2) × (2 × F + (2 × (T - 1))
Sum = (32 ÷ 2) × (2 × 7 + (2 × (32 - 1))
Sum = 16 × (14 + 62)
Sum = 16 × 76
Sum = 1216
Sum of odd numbers from 6 to 69 = 1216
Sum of Odd Numbers Calculator
Please use the tool below to calculate the sum of odd numbers for another set of numbers.