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In previous classes, we learned that a real number is a set of natural numbers, whole numbers, integers, rational numbers, and irrational numbers. We continue our discussion on real numbers in this chapter.

Let us look at the key concepts of the study of numbers.

**1**.

**Euclid's division lemma**

**2**.

**Euclid's division algorithm**

**3**.

**The Fundamental Theorem of Arithmetic**

**4**.

**Modular Arithmetic**

**5**.

**Sequences and Finite Series**