Identify Ratios

24 Feb, 2023

Friday

SWBAT identify ratios from word problems

How many players play in a match of cricket? And how many in a team of kabaddi?

How many players play in a match of cricket? And how many in a team of football?

How many players play in a mixed doubles tennis? And how many in a team of football?

What is a ratio?

• A ratio is a comparison of two or more numbers that indicates their sizes in relation to each other. We denote ratio using the symbol ‘:’

• Rules for using ratios:

  • The units of measurement must be the same.

  • The answer does not state the units of measurement.

1. Identify the first quantity needed to compare ratios

2. Identify the second quantity needed to compare ratios

3. Write in words = ________ to _______

4. Write in fraction = ___/ ___

5. Write using colon = _____ : _____

How to find Ratios:

​a) What is the ratio of students wearing uniforms to those not wearing uniforms in your class?

​Let us see how ratios are calculated and how they are written

b) What is the ratio of students wearing uniforms to the total number of students?

Multiple Choice

Ella has 5 balloons. Taylor has 7 balloons. Write the ratio of Ella's balloons to Taylor's balloons.

• 7:5

• 5:7

• 3:5

• 5:3

Multiple Choice

What is wrong in the given statement?

10 kg : 5 g

• The units of measurement are not the same

• The answer has the units mentioned

• There is nothing wrong in the statement

• Both 1 and 2

Multiple Choice

An aquarium has 14 seals, 22 penguins and 4 sea turtles. What is the ratio of sea turtles to seals?

• 4 : 14

• 14 : 4

• 4 : 40

• 40 : 4

Open Ended

What is the ratio of girls to boys in your class right now?

EXIT SLIP:

• Doing this independently

• Solve each question in the notebook

Multiple Choice

See the figure and find the ratio of Number of triangles to the number of circles.

• 3 : 11

• 3 : 5

• 5 : 3

• 11 : 3

Multiple Choice

For every 5 cups of flour in the recipe, there are 2 cups of milk. Write the ratio of flour to milk.

• 2 : 5

• 2 : 7

• 5 : 7

• 5 : 2

Multiple Choice

Out of 30 students in a class, 5 like football, 15 like cricket and remaining like tennis. Find the ratio of Number of students liking football to the number of students liking tennis.

• 5 : 15

• 5 : 20

• 10 : 30

• 5 : 10