Study guides

Q: What is the sum of the first 13 odd numbers?

Write your answer...

Submit

Related questions

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.

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

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.

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

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

13 + 37

The smallest of the three is 13.

The numbers are 11, 13 and 15.

call the first number x. The second number would be x + 2 (as they're consecutive odd numbers). The sum of both numbers would be x + x + 2 = 28, or 2x + 2 = 28. This can be evaluated to 2x = 26, x = 13. The first number would be 13, the second 15, 13 + 15 = 28.

1, 3 and 9

They are 9, 11 and 13.

To make odd numbers total an odd number, you have to have an odd number of them. 7 + 13 + 43 = 63

13+15+17=45

The numbers are 13, 15 and 17.

They are: 13+15+17 = 45

The numbers are 9, 11, 13, 15 and 17.

How about: 47*13 = 611 and 47+13 = 60

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 = 81

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.

33 = 9 + 11 + 13

26

There is no way without playing silly games. Each of the numbers in the list is odd. The sum of five odd numbers must be odd and therefore, cannot be 50. There is no way without playing silly games. Each of the numbers in the list is odd. The sum of five odd numbers must be odd and therefore, cannot be 50. There is no way without playing silly games. Each of the numbers in the list is odd. The sum of five odd numbers must be odd and therefore, cannot be 50. There is no way without playing silly games. Each of the numbers in the list is odd. The sum of five odd numbers must be odd and therefore, cannot be 50.

Add them up and divide the sum by 2.

The numbers are -13, -11, and -9.

1+3+5+7+9+11+13+15+17+19 equals 100.