2018 PCSR Civil Service Review Guide 1

Week 1: September 24 – October 1, 2017

This week, we are going to learn about Least Common Multiple (LCM) and Greatest Common Divisor (GCD). LCM is needed in adding and subtracting dissimilar fractions, while GCD is needed in reducing fractions to lowest terms. In addition to LCM and GCD, we will also learn about converting improper fractions to mixed number and vice versa.

PART I: MATHEMATICS

A. GCD

Youtube Tutorial Videos (Taglish)

Lesson 1: Understanding Common Divisors
Lesson 2: Common Divisors and Greatest Common Divisor
Lesson 3: Exercises on Getting the GCD
Lesson 4: Getting the GCD by Prime Factorization
Lesson 5: GCD and Reducing Fractions to Lowest Terms

Tutorial Articles

B. LCM

Youtube Tutorial Videos (Taglish)

Lesson 1: Least Common Multiple Part 1
Lesson 2: Least Common Multiple Part 2
Lesson 3: Least Common Multiple Part 3

Tutorial Article

How to Get the Least Common Multiple of Numbers

C. Lowest Terms, Improper Fractions and Mixed Form

Youtube Tutorial Videos (Taglish)