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# What is the sum of the first 13 odd numbers?

Updated: 10/23/2022

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10y ago

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The sum of the first 13 odd numbers is 169.

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10y ago
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### How can you determine weather a sum of severals numbers such as 13 plus 45 plus 24 plus 17 is even or odd?

Count how many of the numbers are odd. If an odd number of them are odd, then their sum is odd. If an even number of them are odd, then their sum is even.

### What are the 5 odd numbers whose sum is 30 from 1 to 13?

An odd number of odd numbers can't add up to an even number.

### What 4 odd numbers equal 13?

The sum of any four odd numbers will never be equal to an odd number.

### What is the sum of the first 1500 consecutive odd numbers?

You can work this out by realizing that the sum of the first x odd numbers is equal to x2.Consider the following examples:The first three odd numbers: 1 + 3 + 5 = 9The first five odd numbers: 1 + 3 + 5 + 7 + 9 = 25The first ten odd numbers: 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 = 100In each case, the number of odds you're adding together is the square root of their sum. This means that the first 1500 consecutive odd numbers have a sum of 15002, which equals 2250000, or two and a quarter million.

### What two odd numbers add up to 13?

The sum of two odd numbers MUST be even. So there is no answer to the question.

### How can you determine wether a sum of several numbers such as 13 45 24 17 is even or odd?

Go through each of the numbers, and count how many of them are odd. If you count an odd number of them, then their sum is odd. If you count an even number of them, then their sum is even.

13 + 37

### What are the nine odd numbers that their sum can be 50?

The nine odd numbers whose sum is 50 are 1, 3, 5, 7, 9, 11, 13, 15, and 1.

### The sum of three consecutive odd numbers is 45 What are the smallest of these numbers?

The smallest of the three is 13.

### 1 The sum of 3 consecutive odd numbers is 39?

The numbers are 11, 13 and 15.

### The sum of all numbers from 8 to 18 is an even number?

If you include 8 and 18 that is 11 numbers and their sum is 143 which is odd ---- Explanations (by the way, it is really not all the numbers between 8 and 18, it is just all the integers. There is an infinite number of numbers between 8 and 18, think of just 8, 8.1, 8.11, 8.111, 8.1111 etc) Here are some other fun ways to do this: One way to do it, of course is just to add 8+ 9 10 11 12 13 14 15 16 17 18 Before you add them all, consider just adding the last column, and looking at the ones column of that number. 8+9+0+1+2+....+8 that number is 53 so the sum is odd. If that numbers is even then the number is even OR Looking at just the odd numbers. The sum of even numbers is always even. An odd number and an even number is an odd number. So if the sum of the odd numbers is even then the last column will be an odd number and the total sum will be odd. The sum of odd numbers is even when there is an even number of them. Look at 2 odd numbers. (ie 3+3 =6, this is two odd numbers and their sum is even) 9,11,13,15,17 are even and there are 5 of them. This is an odd number of odd so the sum is odd. Now we know the sum of the odds and the evens is odd so the total of the last column must be odd and therefore the sum is odd. Another way is to see that the sum of the first n numbers is n(n+1)/2 We can add the sum of the first 18 numbers then subtract the sum of the first 7 numbers and what is left is the sum of the numbers 8 to 18. So in this case we have 18x19/2-8x9/2 which is (18x19-7x8)/2 this simplifies by first dividing the 18 and the 8 by 2 so we have 9x19-4x7= 171-28=143 OR What if we match up and add the 8 and the 18, the 9 and the 17, the 10 and the 16, the 11 and the 15, the 12 and the 14 and you have 13 left. This is the idea behind the formula for the first n numbers. That is 26x5+13=143

### What is three consecutive odd numbers with a sum of 33?

They are 9, 11 and 13.