Sum of Sequences and Formulas

7

8

5

6

Adding numbers from 1 to 100

Multiplying numbers from 1 to 50

Adding numbers from 1 to 50

Subtracting numbers from 1 to 50

The sum of the sequence

The middle number

The last number

The first number

To make it easier to subtract

To simplify multiplication

To facilitate addition

To reverse the sequence

It aligns the numbers for easy addition

It halves the sequence

It becomes a subtraction problem

It doubles the sequence

To make subtraction easier

To halve the sequence

To align numbers for addition

To double the sequence

n

n+1

2n

n-1

n + (n + 1) / 2

(n + 1) * n

n * n / 2

n * (n + 1) / 2

Subtracting the sequence

Doubling the sequence

Flipping the sequence

Dividing the sequence

n-1

2n

n+1

n