Скачать или смотреть 3) Class 6 Maths Chapter 12 Ratio And Proportions- What Is Proportions | Maths Class 6 CBSE NCERT

3) Class 6 Maths Chapter 12 Ratio And Proportions- What Is Proportions | Maths Class 6 CBSE NCERT

Hello students, in this chapter you are going to learn a very good concepts related to the Ratio & Proportions.

I will first tell you what is exactly a Ratio & Proportions means which is very important to know for understanding the whole chapter.

We will go topic wise

1) WHAT IS RATIOS ?
2) EQUIVALENT RATIOS
3) WHAT IS PROPORTIONS?
4) UNITARY METHODS
chapter 12TH CLASS 6TH MATHEMATICS ratio and proportion-
12.1 Introduction
12.2 Ratio
12.3 Proportion-If two ratios are equal, we say that they are in proportion and use the
symbol ‘::’ or ‘=’ to equate the two ratios If two ratios are not equal, then we say that they are not in proportion. In a statement of proportion, the four quantities involved when taken in order are known as respective terms. First and fourth terms are known
as extreme terms. Second and third terms are known as middle terms
12.4 Unitary Method- The method in which first we find the value of one unit and then the value of required number of units is known as Unitary Method.

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what is equivalent ratios or equivalent ratios

What have we discussed?
1. For comparing quantities of the same type, we commonly use the method of
taking difference between the quantities.
2. In many situations, a more meaningful comparison between quantities is made
by using division, i.e. by seeing how many times one quantity is to the other
quantity. This method is known as comparison by ratio.
For example, Isha’s weight is 25 kg and her father’s weight is 75 kg. We
say that Isha’s father’s weight and Isha’s weight are in the ratio 3 : 1.
3. For comparison by ratio, the two quantities must be in the same unit. If they are not, they should be expressed in the same unit before the ratio is taken.
4. The same ratio may occur in different situations.
5. Note that the ratio 3 : 2 is different from 2 : 3. Thus, the order in which quantities are taken to express their ratio is important.

EXERCISE 12.1
1. There are 20 girls and 15 boys in a class.
(a) What is the ratio of number of girls to the number of boys?
(b) What is the ratio of number of girls to the total number of students in the class?
2. Out of 30 students in a class, 6 like football, 12 like cricket and remaining like tennis. Find the ratio of
(a) Number of students liking football to number of students liking tennis.
(b) Number of students liking cricket to total number of students.
3. See the figure and find the ratio of (a) Number of triangles to the number of circles
inside the rectangle.
(b) Number of squares to all the figures inside the rectangle.
(c) Number of circles to all the figures inside the rectangle.