# What Is The Sum Of 15?

## Is 15 a composite number?

which is not prime (i.e., which has factors other than 1 and itself).

The first few composite numbers (sometimes called “composites” for short) are 4, 6, 8, 9, 10, 12, 14, 15, 16, …

There are an infinite number of composite numbers.

….

## What are factors of 18?

Factors of 18:The square root of 18 is 4.2426, rounded down to the closest whole number is 4.Testing the integer values 1 through 4 for division into 18 with a 0 remainder we get these factor pairs: (1 and 18), (2 and 9), (3 and 6). The factors of 18 are 1, 2, 3, 6, 9, 18.

## What numbers can make 15?

15 is a composite number. 15 = 1 x 15 or 3 x 5. Factors of 15: 1, 3, 5, 15.

## What is the sum of a number?

the aggregate of two or more numbers, magnitudes, quantities, or particulars as determined by or as if by the mathematical process of addition: The sum of 6 and 8 is 14. a particular aggregate or total, especially with reference to money: The expenses came to an enormous sum.

## What is a sum example?

In mathematics, a sum is the total obtained from adding numbers. For example, the sum of two and two is four. … In Microsoft Excel, sum is a formula syntax for adding, subtracting, or getting the total numerical content of specific cells. Below are some examples of how the sum formula may be used.

## What has a sum of 20 and a difference of 4?

And since their sum is -4, the negative number is 4 units farther from zero than the positive number, and the sum of their distances from zero is 20. So, we can ask ourselves, what two numbers add up to 20 whose difference is 4. It should be easy to see we need 12 and 8. So the two numbers we need are -12 and 8.

## What can equal to 20?

If you can use more than one of a number, than 2 x 2 x 5 = 20. If you’re asking for 3 different numbers, than 1 x 4 x 5 = 20 or 1 x 2 x 10 = 20.

## What is the formula of sum of n terms?

The Sum Formula The formula says that the sum of the first n terms of our arithmetic sequence is equal to n divided by 2 times the sum of twice the beginning term, a, and the product of d, the common difference, and n minus 1. The n stands for the number of terms we are adding together.

## What number is half of 10?

90 = 80 + 10. Half of 80 is 40; half of 10 is 5; therefore half of 90 is 45.

## What two numbers add to 18?

Three prime numbers that add to 18 are 2, 5, and 11 or 2, 3, and 13.2 + 5 + 11 = 18.2 + 3 + 13 = 18.

## What can you multiply at 17?

Seventeen times multiplication list.1 * 17 = 17.2 * 17 = 34.3 * 17 = 51.4 * 17 = 68.5 * 17 = 85.6 * 17 = 102.7 * 17 = 119.8 * 17 = 136.More items…

## Whats is a factor?

A factor is a number that divides into another number exactly and without leaving a remainder. Most numbers have an even number of factors; however, a square number has an odd number of factors. A prime number has only two factors – the number itself and 1.

## What three numbers add up to 15?

You can also achieve 15, if you add the middle number 5 three times. The odd numbers 1,3,7, and 9 occur twice in the reductions, the even numbers 2,4,6,8 three times and the number 5 once. Therefore you have to place number 5 in the middle of the magic 3×3 square.

## What is the sum of 5?

NumberRepeating Cycle of Sum of Digits of Multiples5{5,1,6,2,7,3,8,4,9}6{6,3,9,6,3,9,6,3,9}7{7,5,3,1,8,6,4,2,9}8{8,7,6,5,4,3,2,1,9}8 more rows

## How can you make a sum of 15?

The possible number whose combination would result in sum of 15 are: 69, 78, 87, 96. So, there are only 4 combinations which would result in 15.

## What is the formula for finding the sum of a series?

The sum of an arithmetic series is found by multiplying the number of terms times the average of the first and last terms. Example: 3 + 7 + 11 + 15 + ··· + 99 has a1 = 3 and d = 4. To find n, use the explicit formula for an arithmetic sequence.

## How do you find the sum of the first 20 terms?

Watch it now.Exercise. Calculate the sum of the first 20 terms of the arithmetic sequence whose formula for the nth term is: un=1+(n−1)×4. … Answers Without Working.Formula 2. Given an arithmetic sequence, we can calculate the sum of its first n terms, Sn, using the formula: Sn=n2(2.

## What has a sum of 18 and a difference of 6?

“THE SUM OF two numbers is 18 and the difference is 6”. So x+y = 18 and x-y = 6. Algebraically, we can add those two equations to find 2x = 24, so x = 12.

## What is the sum of two number?

The result of adding two or more numbers. (because 2 + 4 + 3 = 9).

## What two numbers equal 18?

Answer and Explanation: 1 * 18 = 18. 2 * 9 = 18 and. 2 * 6 = 18.

## What can equal 48?

The factor pairs of the number 48 are: 1 x 48, 2 x 24, 3 x 16, 4 x 12, and 6 x 8. When you multiply each of these factor pairs together, you get 48….

## What is the sum of 14?

If only positive integers greater than or equal to 0 are allowed, the answer is 120. If the digits in a 3-digit integer must add to 14, the answer is 70.

## What is a sum of a series?

The sum of the terms of a sequence is called a series . If a sequence is arithmetic or geometric there are formulas to find the sum of the first n terms, denoted Sn , without actually adding all of the terms.

## What does product mean in math?

In mathematics, a product is the result of multiplication, or an expression that identifies factors to be multiplied. For example, 30 is the product of 6 and 5 (the result of multiplication), and is the product of and. (indicating that the two factors should be multiplied together).

## How do you multiply fractions?

To multiply fractions:Simplify the fractions if not in lowest terms.Multiply the numerators of the fractions to get the new numerator.Multiply the denominators of the fractions to get the new denominator.

## What number is half of 14?

7.001/2 x 14 = 7.00 Which means that our answer of 7.00 is 50.00 percent of 14.

## How do you calculate the sum?

To do this, add the two numbers, and divide by 2. Multiply the average by the number of terms in the series. This will give you the sum of the arithmetic sequence. So, the sum of the sequence 10, 15, 20, 25, 30 is 100.

## How do you split 15 in half?

Answer and Explanation: Half of 15 is 7.5. Halving a number, x, can be done geometrically by finding the midpoint of a number line segment that goes from 0 to x. In other…

## Which two numbers have a sum of 15 and product of 36?

1 Answer. The numbers are 3 and 12 .