Question

Class: VIII, Subject: Mathematics
chapter .1 or 2 ??

Question 1. Find the value of a
a) 1/5 - 5/15=a
b) 1/3 - 5/13=a
c) 5/16 × 2/7=a
d) a × 1/5 - 1/6
Question 2. Write the additive inverse of each of the following: •
a) 1
b) - 1/7
c) - 2/5
d) 2

Question 3. Evaluate:
a) - 1/3×9/10
b) - 25/8×1/3
c) 7/27×10
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Answer 1

Given - Question 1. Find the value of a

a) 1/5 - 5/15=a

b) 1/3 - 5/13=a

c) 5/16 × 2/7=a

d) a × 1/5 - 1/6

Question 2. Write the additive inverse of each of the following: •

a) 1

b) - 1/7

c) - 2/5

d) 2

Question 3. Evaluate:

a) - 1/3×9/10

b) - 25/8×1/3

c) 7/27×10

Find - Value of a, additive inverse and result of questions.

Solution -

Question 1.

a. 1/5-5/15 = a

3-5/15 = a

a = -2/15

b. 1/3-5/13 = a

13-15/39 = a

-2/39 = a

c. 5/63 = a

d. a/5-1/6 = 0

6a-5 = 0

6a = 5

a = 5/6

Question 2.

a. -1

b. 1/7

c. 2/5

d. -2

Question 3.

a. -3/10

b. -25/24

c. 70/27

Additive inverse refers to the specific number, which on addition to given number, yields the result zero. Usually additive inverse is the same number with reverse sign.