Lesson Notes By Weeks and Term v4 - JHS 1

Lesson Video

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Performance objectives

• Define what a ratio is.
• Create tables of equivalent ratios.
• Solve problems involving ratios.
• Understand the link between ratios and fractions.

Lesson summary

Ratios are all around us in Ghana, from the marketplace to our kitchens. When your mother cooks rice, she uses a specific ratio of water to rice to make it perfect. When a tailor mixes colours for tie-dye, they use a ratio to get the right shade. This lesson will help us understand these comparisons, called ratios, and learn how to create different amounts that keep the same balance. We will focus on organising these "balanced" or equivalent ratios into tables, a skill that is useful for everything from cooking for a large family to running a small business.

Lesson notes

What is a Ratio? A ratio is a way to compare two or more quantities. It tells us how much of one thing there is compared to another. For example, if there are 10 boys and 15 girls in a class, the ratio of boys to girls can be written in three ways: Using a colon: 10 : 15 Using words: 10 to 15 As a fraction: 10/15

Important Note: The order matters! The ratio of boys to girls (10:15) is different from the ratio of girls to boys (15:10). For this lesson, we will focus on writing ratios as common fractions. What are Equivalent Ratios? Equivalent ratios are ratios that express the same relationship or proportion. They are just like equivalent fractions. For example, the ratio 1:2 is the same as 2:4, 3:6, and 50:100.

To find an equivalent ratio, you must multiply or divide *both* parts of the ratio by the same non-zero number.

The Golden Rule: Whatever you do to the top number (numerator), you must do to the bottom number (denominator).