This page explains that combining two quantities and counting or measuring the combined quantity is addition in first principles. Addition is also explained using number-line.

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There are `3` red cars and `4` blue cars in the figure. These cars are

Considering the figure with `3` red cars and `4` blue cars. `3` and `4` are combined together and the counting is done from `1` to `7`. The resulting count is `7`.

A red pencil is `3` centimeters in length. A green pencil is `4` centimeters in length.

The two pencils are

`0` and the measure at the end is `7`.

The count or measure of quantities can be combined or *added*.

The *addition* results in count or measure of the combined quantity.

Addition `3+4` is given in

The English word

*familiarize with the terminology *

addition

**Addition - First Principles** : Two numbers are considered, each of which represents a count or measurement. The quantities represented by the numbers are combined to form a result representing a combined count or measurement. The combined count or measurement is the result of addition.

eg: `20` and `13` are combined together `20+13 = 33`.

`20` is an addend

`13` is also an addend

`33` is the sum

*familiarize with the terminology *

addend

*familiarize with the terminology *

sum

*Solved Exercise Problem: *

What is the sum of `4` and `2`?

- `7`
- `6`
- `6`

The answer is '`6`'.

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