What is the sum of odd numbers from 4 to 36? Here we will show you step-by-step how to calculate the sum of odd numbers from 4 to 36.
Step 1) We start by finding the first (F) and last (L) odd numbers from 4 to 36. It is easy to do that by simply looking at the numbers. The first odd number is 5, and the last odd number is 35.
F = 5
L = 35
Step 2) Next, we calculate the total odd numbers (T) there are from 4 to 36, using a formula. Here is the formula and the math:
T = (L - F + 2) ÷ 2
T = (35 - 5 + 2) ÷ 2
T = 32 ÷ 2
T = 16
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 36, like this:
Sum = (T ÷ 2) × (2 × F + (2 × (T - 1))
Sum = (16 ÷ 2) × (2 × 5 + (2 × (16 - 1))
Sum = 8 × (10 + 30)
Sum = 8 × 40
Sum = 320
Sum of odd numbers from 4 to 36 = 320
Sum of Odd Numbers Calculator
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