Use appropriate property and find: - 1 6 × 4 7 + 1 2 - 3 7 × 1 6 .

The given expression is - 1 6 × 4 7 + 1 2 - 3 7 × 1 6 . The sum of three rational numbers does not depend upon the grouping of rational numbers and this is called the associative property for addition of rational numbers. Now, - 1 6 × 4 7 + 1 2 - 3 7 × 1 6 = - 1 6 × 4 7 - 3 7 × 1 6 + 1 2 Using distributive property over subtraction, we get, 1 6 × - 4 7 - 3 7 × 1 6 + 1 2 = 1 6 × - 4 7 - 3 7 + 1 2 = 1 6 × - 4 - 3 7 + 1 2 = 1 6 × - 7 7 + 1 2 = - 1 6 + 1 2 = - 1 6 + 3 6 = - 1 + 3 6 = 2 6 = 1 3 Hence, the required answer is 1 3 .

E M B I B E

Mathematics Textbook of Competency Based Questions for Class VIII>Chapter 1 - Rational Numbers>Exercise>Q 95

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8th CBSE

IMPORTANT

Earn 100

Nine times the reciprocal of a rational number equal $6$ times the reciprocal of $17$ . Find the rational number.

60% studentsanswered this correctly

Important Questions on Rational Numbers

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8th CBSE

IMPORTANT

Mathematics Textbook of Competency Based Questions for Class VIII>Chapter 1 - Rational Numbers>Exercise>Q 96

Use appropriate property and find: $\frac{- 1}{6} \times \frac{4}{7} + \frac{1}{2} - \frac{3}{7} \times \frac{1}{6}$ .

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8th CBSE

IMPORTANT

Mathematics Textbook of Competency Based Questions for Class VIII>Chapter 1 - Rational Numbers>Exercise>Q 97

If a triangle has a base of $10 \frac{3}{4} cm$ and a height of $15 \frac{3}{4} cm$ , what is its area?

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IMPORTANT

Mathematics Textbook of Competency Based Questions for Class VIII>Chapter 1 - Rational Numbers>Exercise>Q 98

In the figure below, Vijay and Radha

1 \frac{4}{5} km

apart from each other on a straight road. Vijay travels to the left up to Radha’s position, then travels

5 \frac{27}{40} km

to the right and stops.
Radha travels

5 \frac{27}{40} km

to the right and travels

1 \frac{4}{5} km

to the left before she stops.
Question Image

What is the distance between Vijay and Radha now?

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IMPORTANT

Mathematics Textbook of Competency Based Questions for Class VIII>Chapter 1 - Rational Numbers>Exercise>Q 99

Which among the following is the greatest rational number?

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IMPORTANT

Mathematics Textbook of Competency Based Questions for Class VIII>Chapter 1 - Rational Numbers>Exercise>Q 100

The cost of

4

calculators and

2

stencils is

R s . 6, 200

. What is the cost of

10

calculators and

5

stencils?

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8th CBSE

IMPORTANT

Mathematics Textbook of Competency Based Questions for Class VIII>Chapter 1 - Rational Numbers>Exercise>Q 101

In an examination, a student was asked to find

\frac{3}{14}

of a certain number. By mistake, he found

\frac{3}{4}

of it. His answer was

150

more than the correct answer. The given number is ?

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IMPORTANT

Mathematics Textbook of Competency Based Questions for Class VIII>Chapter 1 - Rational Numbers>Exercise>Q 102

A water pump pumps out $16 \frac{1}{6} l$ of water per minute from a reservoir. How many litres of water will be pumped out in $1 \frac{1}{5}$ of an hour?

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8th CBSE

IMPORTANT

Mathematics Textbook of Competency Based Questions for Class VIII>Chapter 1 - Rational Numbers>Exercise>Q 103

All rational numbers are closed under