Students can Download Class 7 Maths Chapter 1 Integers Ex 1.2 Questions and Answers, Notes Pdf, KSEEB Solutions for Class 7 Maths helps you to revise the complete Karnataka State Board Syllabus and to clear all their doubts, score well in final exams.
Karnataka State Syllabus Class 7 Maths Chapter 1 Integers Ex 1.2
Question 1.
Write down a pair of integers whose:
a) sum is -7
– 2 + -5 = -7
∴ The two integers be -2 and -5.
b) difference is -7
-20 – (-10) = -10 (∵ -20 – (-10))
-20 + 10 = -10
∴ The two integers be – 20 and -10.
c) sum is 0
Any two integers of same number but different sign.
For eg : 10 + (-10) = 0.
Question 2.
a) Write a pair of negative integers whose difference gives 8.
Solution:
Let – 4 and – 12 are two negative integers.
∴ – 4 – (- 12)
– 4 + 12 = 8
b) Write a negative integer and a positive integer whose sum is – 5.
Solution:
Let – 10 and 5
∴ – 10 + 5 = – 5
c) Write a negative integer and a positive integer whose difference is – 3.
Solution:
Let – 2 and 1
– 2 – (+ 1)
– 2 – 1 = – 3
Question 3.
In a quiz, team A scored – 40, 10, 0, and Team B scored 10, 0, – 40 in three successive rounds. Which team scored more? Can we say that we can add integers in any order?
Solution:
Team A scored = -40 + 10 + 0 = -30
TeamB scored = 10 + 0 – 40 = -30
Yes. We can add integers in any order.
Question 4.
Fill in the blanks to make the following statements true:
i) (- 5) + (- 8) = (- 8) + (……..)
(- 5) + (- 8) = (- 8) + (- 5)
ii) 53 + = – 53
– 53 + 0 = – 53
iii) 17 + …. 0
17 + – 17 = 0
iv) 113 + (- 12) + (……) = 13 + [(- 12) + (- 7)]
[13 + (- 12) + (- 7) = 13 + [(- 12) + (- 7)]
v) (- 4) + [15 + (- 3)] = [- 4 + 15] + – 3
(- 4) + [15 + (- 3)] = [- 4 + 15] + – 3.