NCERT MATHS SOLUTION CLASS 7 EXERCISE 8.2

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Some of the major chapters that are introduced in the subject of mathematics. Q42 : is equal to A.

Determine the area of the triangles. How many questions has he attempted correctly and how many has he attempted incorrectly? If it decreases at the rate of 2°C per hour until midnight, at what time would the temperature be 8°C below zero?

NCERT Solutions for Class 7 Math Chapter 11

Is it also less than the temperature at Srinagar. Answer: a By observing the given data, the temperatures of these cities are as follows. Question 2: In a quiz, positive marks are given for correct answers and negative marks are given for incorrect answers. Total score of Jack at the end will be the sum of these scores. What was the temperature of Srinagar on Tuesday. On Wednesday, it rose by 4°C. What was the temperature on this ncert math solution class 7. Question 4: A plane is flying at the height of 5000 m above the sea level. At a particular point, it is exactly above a submarine floating 1200 m below the sea level. What is the ncert math solution class 7 distance between them. If withdrawal of amount from the account is represented by a negative integer, then how will you represent the amount deposited. Answer: Since the amount withdrawn is represented by a negative integer, the amount deposited will be represented by a positive integer. Question 6: Rita goes 20 km towards east from a point A to the point B. From B, she moves 30 km towards west along the same road. If the distance towards east is represented by a positive integer then, how will you represent the distance travelled towards west. By which integer will you represent her final position from A. Answer: Since the distance towards east is represented by a positive integer, the distance travelled towards west will be represented by a negative integer. Question 7: In a magic square each row, column and diagonal have the same sum. Check which of the following is a magic square. Answer: It can be observed that in square ievery row and column add up to give 0. However, the sum of one of its diagonals is not 0. Therefore, ii is a magic square. Question 10: A water tank has steps inside it. A monkey is sitting on the topmost step i. The water level is at the ninth step. In how many jumps will he reach the water level. For this, he jumps 4 steps up and then jumps back 2 steps down in every move. In how many jumps will he reach back the top step. So, what will the sum 8 in b represent. Answer: Let the steps moved down be represented by positive integers and the steps moved up be represented by negative integers. Can we say that we can add integers in any order. Yes, we can add integers in any order. We had observed that the scores obtained by both teams in successive rounds were numerically equal but different in order. Yet, the total score of both teams were equal. What will be the room temperature 10 hours after the process begins. What is its profit or loss. Answer: Profit is denoted by a positive integer and loss is denoted by a negative integer. Question 9: Replace the blank with an integer to make it a true statement. If it decreases at the rate of 2°C per hour until midnight, at what time would the temperature be 8°C below zero. What would be the temperature at mid-night. It will take 12 hours to be midnight i. If ncert math solution class 7 has got 12 correct answers, how many questions has she attempted incorrectly. How many questions has she attempted incorrectly. How many questions has he attempted correctly and how many has he attempted incorrectly. Answer: Distance descended is denoted by a negative integer.

Percentages are numerators of fractions with denominator 100. The area of the rectangular park is equal to a square park. Important questions with answers of Coordinate Geometry Exercise 7. If withdrawal of amount from the account is represented by a negative integer, then how will you represent the amount deposited? Determine the breadth of the rectangular park. Answer: Since the distance towards east is represented by a positive integer, the distance travelled towards west will be represented by a negative integer.