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## What are all the sums of 15?

**The sum of all factors of 15 is 24 and its factors in Pairs are (1, 15) and (3, 5).**

- Factors of 15: 1, 3, 5 and 15.
- Negative Factors of 15: -1, -3, -5 and -15.
- Prime Factors of 15: 3, 5.
- Prime Factorization of 15: 3 × 5 = 3 × 5.
- Sum of Factors of 15: 24.

## How many different sets of consecutive integers have a sum of 15?

There are **three three possible sets**.

If the sum of n consecutive positive integers starting with a equals 15, then 1/2n(2a+n−1)=15.

## What three numbers add up to 15?

Another approach is to consider the ways to obtain 15 as a sum of 3 different numbers in the range 1.. 9. These are: **1+5+9, 1+6+8, 2+4+9, 2+5+8, 2+6+7, 3+4+8, 3+5+7, 4+5+6**. As you can see there are only 8 ways, and you need 8 different sums in your square.

## What is the sum of the five consecutive numbers from 1 to 15?

Therefore, the numbers must be 1,2,3,4,5. Those five numbers add up to 15 to confirm that this answer is correct. The sum of five consecutive numbers is **100**.

## What two numbers add up to 15 and subtract to 1?

Therefore, the numbers are **8 and 7**.

## What is the additive inverse of 15?

The additive inverse of (-15) is **(+15)**. Remember additive inverse of any number is the number itself with change is that change its sign (positive or negative).

## What three numbers add up to 16?

**6 + 7 + 3** = 16. Here we have the example of adding the three single-digit numbers 8 + 9 + 2.

## What are the three consecutive integers add up to 51?

Three consecutive integers add up to 51. What are these integers? Let consecutive numbers be, x, x+1 and x+2. Thus, the required three consecutive numbers are: **16, 17 and 18**.

## How do you get 15 in each row?

In a magic square you have to add 3 numbers again and again. Therefore the average sum of three numbers is 45_3=15. The number 15 is called the magic number of the 3×3 square. You can also achieve 15, if **you add the middle number 5 three times**.