Topic: Representing shared portions (Ratio and Percentage. (Lesson 4)

FOCUS QUESTION

How can I represent shared portions?

SPECIFIC OBJS.

1. Apply the concept of ratio to percentage forms and use the symbol % correctly

2. Solve problems requiring the conversion of fractions to percentages and vice versa.

CONTENT SUMMARY

ENGAGE

What do you remember about percentage?

What is the symbol that represents percent? make it in the air.

Now ratios can be written as percentages and vice-versa.

First you have to write the given ratio as a fraction.

Examine the example below.

EXPLORE

How did I arrive at 25?

Look at another method.

Let's listen to this video clip on ratios to percentages.

Now you can also convert a percentage to a ratio.

Eg. Write 20% as a ratio.

Step 1: Write the given percentage as a fraction

20/100

Step 2 : Simplify the fraction where possible

20/100 = 1/5

Step 3: Write the simplified fraction as a ratio in the form below.

1:5

You can watch the video clip below for further clarity.

EXPLAIN

Now try these two problems and be ready to explain your steps.

(1) Write the ratio 4: 5 as a percentage

(2) Write 65% as a ratio

EXTEND/ELABORATE

Choose a partner and complete any three of the following,

EVALUATE

GRADE 6 CONCEPTS - (NSC) by Janice Bowes-Wellington