## PCSR Civil Service Exam Review Guide 5

After learning the operations on fractions in Review Guide 3 and Review Guide 4, let us turn our attentionto operations on decimals this week. In this tutorial, we are going to learn addition, subtraction, multiplication, and division. Here is your review guide from the week.

PART I: MATHEMATICS

A. Operations on Decimals

A.1 Videos

A.2 More videos

Lesson 1: How to Add Numbers with Decimals
Lesson 2: How to Subtract Numbers with Decimals
Lesson 3: How to Multiply Numbers with Decimals
Lesson 4: How to Divide Numbers with Decimals

A.3 Articles

Lesson 1: How to Add Numbers with Decimals
Lesson 2: How to Subtract Numbers with Decimals
Lesson 3: How to Multiply Numbers with Decimals
Lesson 4: How to Divide Numbers with Decimals

PART II: ENGLISH

A. Vocabulary

Civil Service Exam Vocabulary Review Part 5
Tip: Try to memorize the words and use it in your own words.

B. Grammar – The Perfect Progressive Tenses

Lesson 1: Present Perfect Progressive Tense
Lesson 2: Past Perfect Progressive
Lesson 3: Future Perfect Progressive

Enjoy!

## Week 7 Review: Practice Exercises and Problems

Now that we have learned how to operate with decimals and percents and how to convert from one representation to another, let’s have some exercises.

Exercise 1
a.) 1.2 + 3.02 + 4.003
b.) 1.05 + 0.006 + 4.501
c.) 12.1 – 4.25
d.) 11.8 – 2.005
e.) 12.1 – 21.53 + 2.563

Exercise 2
a.) 3 × 0.41
b.) 0.02 × 0.56
c.) 5.1 × 0.45
d.) 5.8 × 4.25
e.) 2.8 × 3.2 × 0.6

Exercise 3
a.) 3 ÷ 0.2
b.) 5.1 ÷ 0.3
c.) 6.4 ÷ 4
d.) 8.1 ÷ 0.009
e.) 0.125 ÷ 0.25

Problems

1.) Convert 0.25 to fraction.

2.) Convert 1/8 to decimal.

3.) Convert 3/4 to percent.

4.) Convert 35% to fraction.

5.) Convert 20% to decimal.

## Practice Quiz on Converting Percent to Fraction

We have already learned how to convert percent to fraction. This post allows you to practice what you have already learned.

Practice Quiz: Converting Percent to Fraction

Convert the following percent to their equivalent fractions

1.) 25%

2.) 80%

3.) 2.5%

4.) 20%

## How to Convert Percent to Fraction

In Civil Service Examinations, as well as other examinations in basic mathematics, knowing how to convert  percent, fractions, and decimals to each other is very advantageous especially if you can do it mentally. Let us try with the following example.

A P640 shirt is marked 25% discount. How much will you have to pay for it?

It seems that you need a pencil for this problem, but you can actually do it in your head. Read it to believe it.

The equivalent of 25% in fraction is 1/4, therefore, you have to take away the fourth of the price. Now, 1/4 of 640 seems difficult but what if we try to split it to 600 + 40? Now, 1/4 of 600 is 150, which means that from the 600, you have 450 left. Now, 1/4 of 40 is 10, which means that you have 30 left. So, 450 + 30 is 480 and that is the discounted price of the t-shirt. Continue Reading