What is the sum of odd numbers from 122 to 141? Here we will show you step-by-step how to calculate the sum of odd numbers from 122 to 141.
Step 1) We start by finding the first (F) and last (L) odd numbers from 122 to 141. It is easy to do that by simply looking at the numbers. The first odd number is 123, and the last odd number is 141.
F = 123
L = 141
Step 2) Next, we calculate the total odd numbers (T) there are from 122 to 141, using a formula. Here is the formula and the math:
T = (L - F + 2) ÷ 2
T = (141 - 123 + 2) ÷ 2
T = 20 ÷ 2
T = 10
Step 3) Finally, we use the information from Step 1 and Step 2, and another formula, to calculate the sum of odd numbers from 122 to 141, like this:
Sum = (T ÷ 2) × (2 × F + (2 × (T - 1))
Sum = (10 ÷ 2) × (2 × 123 + (2 × (10 - 1))
Sum = 5 × (246 + 18)
Sum = 5 × 264
Sum = 1320
Sum of odd numbers from 122 to 141 = 1320
Sum of Odd Numbers Calculator
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