We will learn how to find the rational number in different forms using the properties in expressing a given rational number.

**1.** Express \(\frac{-3}{10}\) as a rational number with denominator 20.

**Solution: **

In order to express \(\frac{-3}{10}\) as a rational number with denominator 20, we first find the number which when multiplied by 10 gives 20.

Clearly, such a number = 20 ÷ 10 = 2

Multiplying the numerator and denominator of \(\frac{-3}{10}\) by 2, we have

\(\frac{-3}{10}\) = \(\frac{(-3) × 2}{10 × 2}\) = \(\frac{-6}{20}\)

Therefore, expressing \(\frac{-3}{10}\) as a rational number with denominator 20 is \(\frac{-6}{20}\).

**2.** Express \(\frac{-3}{10}\) as
a rational number with denominator -30.

**Solution: **

In
order to express \(\frac{-3}{10}\) as a rational number with denominator -30, we first

find a number which when multiplied by 10 gives -30.

Clearly, such a number is = (-30) ÷ 10 = -3.

Multiplying the numerator and denominator of \(\frac{-3}{10}\) by -3, we have

\(\frac{-3}{10}\) = \(\frac{(-3) × (-3)}{10 × (-3)}\) = \(\frac{9}{-30}\)

Therefore, expressing \(\frac{-3}{10}\) as a rational number with denominator -30 is \(\frac{9}{-30}\).

**3. **Express \(\frac{42}{-63}\) as a rational number with denominator 3.

**Solution:**

In order to express \(\frac{42}{-63}\) as a rational number with denominator 3, we first find a number which gives 3 when -63 is divided by it.

Clearly, such a number = (-63) ÷ 3 = -21

Dividing the numerator and denominator of \(\frac{42}{-63}\) by -21, we get

\(\frac{42}{-63}\) = \(\frac{42 ÷ (-21)}{(-63) ÷ (-21)}\) = \(\frac{-2}{3}\)

Therefore, expressing \(\frac{42}{-63}\) as a rational number in different form with denominator 3 is \(\frac{-2}{3}\).

**4.
**Fill
in the blanks with the
appropriate number in the denominator:

\(\frac{7}{13}\) = \(\frac{35}{.....}\) = \(\frac{-63}{.....}\)

**Solution: **

We
have, 35 ÷ 7 = 5

Therefore, \(\frac{7}{13}\) = \(\frac{7 × 5}{13 × 5}\) = \(\frac{35}{65}\)

Similarly, we have (-63) ÷ 7 = -9

Therefore, \(\frac{7}{13}\) = \(\frac{7 × (-9)}{13 × (9)}\) = \(\frac{-63}{-117}\)

Hence, \(\frac{7}{13}\) = \(\frac{35}{65}\) = \(\frac{-63}{-117}\)

● **Rational Numbers**

Introduction of Rational Numbers

Is Every Rational Number a Natural Number?

Is Every Rational Number an Integer?

Is Every Rational Number a Fraction?

Equivalent form of Rational Numbers

Rational Number in Different Forms

Properties of Rational Numbers

Lowest form of a Rational Number

Standard form of a Rational Number

Equality of Rational Numbers using Standard Form

Equality of Rational Numbers with Common Denominator

Equality of Rational Numbers using Cross Multiplication

Comparison of Rational Numbers

Rational Numbers in Ascending Order

Rational Numbers in Descending Order

Representation of Rational Numbers on the Number Line

Rational Numbers on the Number Line

Addition of Rational Number with Same Denominator

Addition of Rational Number with Different Denominator

Properties of Addition of Rational Numbers

Subtraction of Rational Number with Same Denominator

Subtraction of Rational Number with Different Denominator

Subtraction of Rational Numbers

Properties of Subtraction of Rational Numbers

Rational Expressions Involving Addition and Subtraction

Simplify Rational Expressions Involving the Sum or Difference

Multiplication of Rational Numbers

Properties of Multiplication of Rational Numbers

Rational Expressions Involving Addition, Subtraction and Multiplication

Reciprocal of a Rational Number

Rational Expressions Involving Division

Properties of Division of Rational Numbers

Rational Numbers between Two Rational Numbers

**8th Grade Math Practice****From Rational Number in Different Forms to HOME PAGE**

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● **Rational Numbers - Worksheets**

Worksheet on Equivalent Rational Numbers

Worksheet on Lowest form of a Rational Number

Worksheet on Standard form of a Rational Number

Worksheet on Equality of Rational Numbers

Worksheet on Comparison of Rational Numbers

Worksheet on Representation of Rational Number on a Number Line

Worksheet on Adding Rational Numbers

Worksheet on Properties of Addition of Rational Numbers

Worksheet on Subtracting Rational Numbers

Worksheet on Addition and
Subtraction of Rational Number

Worksheet on Rational Expressions Involving Sum and Difference

Worksheet on Multiplication of Rational Number

Worksheet on Properties of Multiplication of Rational Numbers

Worksheet on Division of Rational Numbers

Worksheet on Properties of Division of Rational Numbers

Worksheet on Finding Rational Numbers between Two Rational Numbers

Worksheet on Word Problems on Rational Numbers

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