Standard Eight Mathematics>Chapter 1 - Numbers>Exercise 1.7>Q 12

EASY

8th Tamil Nadu Board

IMPORTANT

Earn 100

Give an example and verify the following statement.

Division is not associative for rational numbers.

Important Questions on Numbers

EASY

8th Tamil Nadu Board

IMPORTANT

Standard Eight Mathematics>Chapter 1 - Numbers>Exercise 1.7>Q 12

Give an example and verify each of the following statements.

Distributive property of multiplication over subtraction is true for rational numbers. That is, $a (b - c) = a b - a c$ .

EASY

8th Tamil Nadu Board

IMPORTANT

Standard Eight Mathematics>Chapter 1 - Numbers>Exercise 1.7>Q 12

Give an example and verify each of the following statements.

The mean of two rational numbers is rational and lies between them.

EASY

8th Tamil Nadu Board

IMPORTANT

Standard Eight Mathematics>Chapter 1 - Numbers>Exercise 1.7>Q 13

If

\frac{1}{4}

of a ragi adai weighs

120

grams, what will be the weight of

\frac{2}{3}

of the same ragi adai?

EASY

8th Tamil Nadu Board

IMPORTANT

Standard Eight Mathematics>Chapter 1 - Numbers>Exercise 1.7>Q 14

If

p + 2 q = 18

and

p q = 40

, find

\frac{2}{p} + \frac{1}{q}

.

MEDIUM

8th Tamil Nadu Board

IMPORTANT

Standard Eight Mathematics>Chapter 1 - Numbers>Exercise 1.7>Q 15

Find

' x'

if

5 \frac{x}{5} \times 3 \frac{3}{4} = 21

.

EASY

8th Tamil Nadu Board

IMPORTANT

Standard Eight Mathematics>Chapter 1 - Numbers>Exercise 1.7>Q 16

By how much does

\frac{1}{(\frac{10}{11})}

exceed

\frac{(\frac{1}{10})}{11}

?

HARD

8th Tamil Nadu Board

IMPORTANT

Standard Eight Mathematics>Chapter 1 - Numbers>Exercise 1.7>Q 17

A group of

1536

cadets wanted to have a parade forming a square design. Is it possible? If it is not possible how many more cadets would be required?

HARD

8th Tamil Nadu Board

IMPORTANT

Standard Eight Mathematics>Chapter 1 - Numbers>Exercise 1.7>Q 18

Evaluate

\sqrt{286225}

and use it to compute

\sqrt{2862.25} + \sqrt{28.6225}

.