Students can Download Maths Chapter 7 Rational Numbers Ex 7.1 Questions and Answers, Notes Pdf, KSEEB Solutions for Class 8 Maths helps you to revise the complete Karnataka State Board Syllabus and score more marks in your examinations.

## Karnataka Board Class 8 Maths Chapter 7 Rational Numbers Ex 7.1

1. Identify the property in the following statements.

Question (i)

2 + (3 + 4) = (2 + 3) + 4

Answer:

Associative property of addition.

Question (ii)

2 × 8 = 8 × 2

Answer:

Commutative property of multiplication

Question (iii)

8 × (6 + 5) = (8 × 6) + (8 × 5)

Answer:

Distributive property of multiplication over addition in integers.

Question 2.

Find the additive inverse of the following integers.

Answer:

Integer Additive inverse

6 -6

9 -9

123 -123

-76 76

-85 85

1000 -1000

3. Find the integer m in the following:

Question (i)

m + 6 = 8

Answer:

m = 8 – 6

Question (ii)

m + 25 = 15

Answer:

m =15 – 25

m = -10

Question (iii)

m – 40 = -26

Answer:

m = – 26 + 40

m = 14

Question (iv)

m + 28 = – 49

Answer:

m = – 49 – 28

m = – 77

Question 4.

Write the following in increasing order: 21, -8, -26, 85, 33, -333, -210, 0, 2011

Answer:

-333 < -210 < -26 < -8 < 0 < 21 < 33 < 85 < 2011.

-333, -210, -26, -8, 0, 21, 33, 85, 2011

Question 5.

Write the following in decreasing order: 85, 210, -58, 2011, -1024, 528, 364, -10000,12

Answer:

2011 > 528 > 364 > 210 > 85 > 12 > – 58 > -1024 < -10,000

2011, 528, 364, 210, 85, 12, -58, -1024, -10,000.