Q8) Ex 2.1 Maths Class 7 Chapter 2 Fractions And Decimals | Maths Class 7 NCERT Apni ClassRoom

Описание: Q8) Ex 2.1 Maths Class 7 Chapter 2 Fractions And Decimals | Maths Class 7 NCERT Apni ClassRoom

Hello students, in this chapter you are going to learn a very good concepts related to the Fractions And Decimals .

I will first tell you what is exactly a Fractions And Decimals means which is very important to know for understanding the whole chapter.

We will go topic wise
1) What is Exactly Fraction IS?
2) TYPES OF FRACTIONS:
PROPER FRACTIONS , IMPROPER FRACTIONS, MIXED FRACTIONS,
LIKE AND UNLIKE FRACTIONS
3) CONVERTING MIXED FRACTIONS TO IMPROPER FRACTIONS
4) ADDITIONS AND SUBTRACTION OF FRACTIONS
5) MULTIPLICATION OF FRACTION
A) MULTIPLICATION BY A WHOLE NUMBERS
B) MULTIPLICATION OF FRACTION BY A FRACTION
6) FRACTION AS AN OPERATOR 'OF'
7) DIVISION OF FRACTION
A) DIVISION OF WHOLE NUMBERS BY A FRACTION
B) RECIPROCAL OF FRACTION
C) DIVISION OF A FRACTION BY A WHOLE NUMBER
D) DIVISION OF FRACTION BY ANOTHER FRACTION
8) WHAT IS DECIMALS NUMBERS?
9) MULTIPLICATION OF DECIMAL NUMBERS BY WHOLE NUMBERS
10) MULTIPLICATION OF DECIMAL NUMBERS BY 10, 100,1000....
11) MULTIPLICATION OF DECIMAL NUMBERS BY A DECIMAL NUMBERS
12) DIVISIONS OF DECIMAL NUMBERS
13) DIVISIONS OF DECIMAL NUMBERS BY 10, 100, 1000
14) DIVISIONS OF DECIMAL NUMBERS BY WHOLE NUMBERS
15) DIVISIONS OF DECIMAL NUMBERS BY ANOTHER DECIMAL NUMBERS

class 7th exercise 2.1 question number 8,
class 7th maths exercise 2.1 question number 8,
class 7th chapter 2 fractions and decimals exercise 2.1,
maths ex 2.1 chapter 2 fractions and decimals,
class 7th fractions and decimals ex 2.1,


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WHAT HAVE WE DISCUSSED?
1. We have learnt about fractions and decimals alongwith the operations of addition and subtraction on them, in the earlier class.
2. We now study the operations of multiplication and division on fractions as well as on decimals.
3. We have learnt how to multiply fractions. Two fractions are multiplied by multiplying their numerators and denominators seperately and writing the product as
product of numerators product of denominators . For example, 2 5 2 × 5 10 ×
3 7 3× 7 21 = = .

EXERCISE 2.1
2. Arrange the following in descending order:
3. In a “magic square”, the sum of the numbers in each row, in each column and along the diagonals is the same. Is this a magic square?
4. A rectangular sheet of paper is cm long and 2 10 3 cm wide.
Find its perimeter.
5. Find the perimeters of (i) ?ABE (ii) the rectangle BCDE in this figure. Whose perimeter is greater?
6. Salil wants to put a picture in a frame. The picture is 7 3 5 cm wide.
To fit in the frame the picture cannot be more than 7 3 10 cm wide. How much should the picture be trimmed? (Along the first row 4 9 2 15 11 11 11 11
+ = ).
7. Ritu ate 3 5 part of an apple and the remaining apple was eaten by her brother Somu. How much part of the apple did Somu eat? Who had the larger share? By how
much?
8. Michael finished colouring a picture in 7 12 hour. Vaibhav finished colouring the same picture in 3 4 hour. Who worked longer? By what fraction was it longer?

EXERCISE 2.2
1. Which of the drawings (a) to (d) show :
2. Some pictures (a) to (c) are given below. Tell which of them show:
3. Multiply and reduce to lowest form and convert into a mixed fraction:
4. Shade: (i) of the circles in box (a) (ii) of the triangles in box (b)
6. Multiply and express as a mixed fraction :
8. Vidya and Pratap went for a picnic. Their mother gave them a water bottle that
contained 5 litres of water. Vidya consumed 2 5
of the water. Pratap consumed the remaining water.
(i) How much water did Vidya drink?
(ii) What fraction of the total quantity of water did Pratap drink?

EXERCISE 2.3
1. Find:
2. Multiply and reduce to lowest form (if possible) :
3. Multiply the following fractions:
4. Which is greater:
5. Saili plants 4 saplings, in a row, in her garden. The distance between two adjacent
saplings is 3 4 m. Find the distance between the first and the last sapling.
6. Lipika reads a book for 3 1 4 hours everyday. She reads the entire book in 6 days.
How many hours in all were required by her to read the book?
7. A car runs 16 km using 1 litre of petrol. How much distance will it cover using
8. (a) (i) Provide the number in the box , such that
(ii) The simplest form of the number obtained in is _____.
(b) (i) Provide the number in the box , such that 3 24
(ii) The simplest form of the number obtained in is _____.