The document explains the concept of ratios, illustrating how to compare two quantities through examples involving fruits, burgers, cupcakes, chicken, and mutton. It emphasizes that ratios can be expressed without units and can involve different types of quantities. The lesson concludes by encouraging practice in recognizing and working with ratios.

1. FINDING RATIOS
Pekan 17 Sesi 4

2. Aim of Lesson :
After learning process,
student will be able to using
ratio correctly.

3. Let’s watch

4. Using Rations to Compare Two Quantities
Example 1
There are 4 strawberries and 5 oranges
The ratio of number of strawberries to the number of oranges is 4 : 5
We read 4 : 5 as 4 to 5.
The ratio of the number of oranges to the number of strawberries is 5 : 4
We read 5 : 4

5. Example 2
Aras bought 2 packs of burgers and 3 pack of cupcakes.
The ratio of the number of burgers to the number of cupcakes is 2 : 3
The ratio of the number of cupcakes to the number of burgers is 3 : 2
The number of items in each pack is the same.
Each pack represents one unit.
A ratio may not give the actual number burger
and cupcakes.

6. Example 3
Ruzi buys 2 kg of chicken and 9 kg of mutton.
The ratio of the mass of chicken to the mass of mutton is 2 : 9
The ratio of the mass of mutton to the mass of chicken is 9 : 2
To compare the masses, they must be in the
same unit.
However, we do not include the unit in the ratio.

7. Example 4
The ratio of the length of the eraser to the length of the crayon is 3 : 8
The ratio of the length of the crayon to the length of the eraser is 8 : 3
The ratio of the length of the eraser to the total length of the eraser and the crayon is 3 : 11
Total Length = the length of eraser + length of the crayon = 3 + 8 = 11

8. Example 5
Draw models to show the ratio X : Y = 9 : 7
X = 9
Y= 7

9. Let’s Practice!
Work Book 5A
Page 105 and 106

10. Answer Key!

11. Conclusion
Two or more quantities can be
compared by division and the comparison
expressed as a ratio.
If you do something often enough, a ratio
will appear