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420**Review of previous class**

**Divisibility**

**Properties of Divisibility**

**What is Euclid Division ?**

**Euclid Division lemma**

**Proof of Euclid division lemma**

**Prove that one of every three consecutive positive integers is divisible by 3.**

**Euclid division algorithm**

**HCF of two positive integers
**

**Use Euclid's division algorithm to find the HCFof 210 and 55.**