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NCERT solutions Mathematics Class 8 chapter 1 Rational Numbers

Chapter 1 - Rational Numbers

Pages 14 - 15

Using appropriate properties find.

-2/3 xx 3/5 + 5/2 - 3/2 xx 1/6

Q 1.1 | Page 14

Using appropriate properties find

2/5 xx (-3/7) - 1/6 xx 3/2 + 1/14 xx 2/5

Q 1.2 | Page 14

Write the additive inverse of: 2/8

Q 2.1 | Page 14

Write the additive inverse of  (-5)/9

Q 2.2 | Page 14

Write the additive inverse of (-6)/(-5)

Q 2.3 | Page 14

Write the additive inverse of  2/(-9)

Q 2.4 | Page 14

Write the additive inverse of 19/(-6)

Q 2.5 | Page 14

Verify that – (– x) = x for x = 11/15

Q 3.1 | Page 14

Verify that – (– x) = x for x = -13/17

Q 3.2 | Page 14

Find the multiplicative inverse of -13

Q 4.1 | Page 14

Find the multiplicative inverse (-13)/19

Q 4.2 | Page 14

Find the multiplicative inverse of 1/5

Q 4.3 | Page 14

Find the multiplicative inverse  (-5)/8 xx (-3)/7

Q 4.4 | Page 14

Find the multiplicative inverse of -1 xx (-2)/5

Q 4.5 | Page 14

Find the multiplicative inverse -1

Q 4.6 | Page 14

Name the property under multiplication used in given

(-4)/5 xx 1 = 1 xx (-4)/5 = -4/5

Q 5.1 | Page 14

Name the property under multiplication used in given

-13/17 xx (-2)/7 = (-2)/7 xx (-13)/17

Q 5.2 | Page 14

Name the property under multiplication used in given

-19/29 xx 29/(-19) = 1

Q 5.3 | Page 14

Multiply 6/13 by the reciprocal of -7/16

Q 6 | Page 14

Tell what property allows you to compute 1/3 xx(6xx4/3) as (1/3 xx 6) xx 4/3

Q 7 | Page 14

Is 8/9 the multiplicative inverse of -1 1/8? Why or why not?

Q 8 | Page 14

Is 0.3 the multiplicative inverse of 3 1/3 ? Why or why not?

Q 9 | Page 14

Write: The rational number that does not have a reciprocal

Q 10.1 | Page 15

Write : The rational numbers that are equal to their reciprocals.

Q 10.2 | Page 15

Write : The rational number that is equal to its negative.

Q 10.3 | Page 15

Fill in the blanks

Zero has __________ reciprocal.

Q 11.1 | Page 15

Fill in the blanks

The numbers __________ and __________ are their own reciprocals

Q 11.2 | Page 15

Fill in the blanks

The reciprocal of − 5 is ______.

Q 11.3 | Page 15

Fill in the blanks

Reciprocal of 1/x where x != 0 is _______

Q 11.4 | Page 15

Fill in the blanks.

The product of two rational numbers is always a ________.

Q 11.5 | Page 15

Fill in the blanks

The reciprocal of a positive rational number is ________.

Q 11.6 | Page 15

Page 20

Represent these numbers on the number line

7/4

Q 1.1 | Page 20

Represent these numbers on the number line.

-5/6

Q 1.2 | Page 20

Represent (-2)/11, (-5)/11, (-9)/11 on the number line.

Q 2 | Page 20

Represent (-2)/11, (-5)/11, (-9)/11 on the number line.

Q 2 | Page 20

Write five rational numbers which are smaller than 2.

Q 3 | Page 20

Find ten rational numbers between (-2)/5 and 1/2

Q 4 | Page 20

Find five rational numbers between 2/3 " and " 4/5

Q 5.1 | Page 20

Find five rational numbers between (-3)/2 " and " 5/3

Q 5.2 | Page 20

Find five rational numbers between 1/4 " and " 1/2

Q 5.3 | Page 20

Write five rational numbers greater than − 2

Q 6 | Page 20

Find ten rational numbers between 3/5 " and " 3/4

Q 7 | Page 20

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