### Numbers: Integers

### Sum, terms, product and factors

Addition and subtraction

**Addition** and **subtraction** are considered prerequisite knowledge for this chapter.

\[\begin{array}{ll}

2+3=5 \qqqquad&5-3=2\\

25+8 = 33 &33-8=25

\end{array}\]

An addition is also called a **sum**.

The sum of #2# and #3# is #2+3=5#.

The numbers #2# and #3# are called the **t****erms** of the sum.

Multiplication and division

We also consider **multiplication **and **division** as prerequisite knowledge in this chapter:

\[\begin{array}{ll}

2 \times 2 =4 \qqqquad&4:2=2\\

3 \times 8 =24 &24:3=8

\end{array}\]

A multiplication is also called a **product**.

The product of #3# and #8# is #3\times 8=24.#

The numbers #3# and #8# are called the **factors **of the product.

The product #3\times 8# means #8+8+8#.

The terms of #13+15# are:

\[13 \text{ and } 15\]

\[13 \text{ and } 15\]

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