(SECTION C - 6 MARKS)

1. Write:
[tex]\[
\begin{array}{l}
\frac{-8}{11}, \frac{-4}{9}, \frac{2}{3} \\
\text{Result: } 8 = y, \frac{2}{3}
\end{array}
\][/tex]

A rational number which has no reciprocal. [tex]\( x \)[/tex]

2. A rational number whose product with a given rational number is equal to the given rational number.

3. A rational number which is equal to its reciprocal.

(SECTION D - 5 MARKS)

(i) Find three rational numbers between [tex]\(\frac{3}{7}\)[/tex] and [tex]\(\frac{2}{3}\)[/tex].

(ii) Find [tex]\(\frac{3}{7} + \left(-\frac{6}{11}\right) + \left(-\frac{8}{21}\right) + \frac{5}{22}\)[/tex].

(iii) Represent [tex]\(-\frac{2}{11}, -\frac{5}{11}, -\frac{9}{11}\)[/tex] on the number line.

(iv) What should be added to [tex]\(-\frac{16}{3}\)[/tex] to make it [tex]\(\frac{1}{9}\)[/tex]?

(v) What is the additive inverse of [tex]\(\frac{3}{5}\)[/tex]?

To find three rational numbers between [tex]\(\frac{3}{7}\)[/tex] and [tex]\(\frac{2}{3}\)[/tex], first convert them to equivalent fractions with a common denominator (LCM of 7 and 3 is 21). Hence:

[tex]\[
\begin{array}{l}
\frac{3}{7} = \frac{3 \times 3}{7 \times 3} = \frac{9}{21} \\
\frac{2}{3} = \frac{2 \times 7}{3 \times 7} = \frac{14}{21}
\end{array}
\][/tex]

Now, three rational numbers between [tex]\(\frac{9}{21}\)[/tex] and [tex]\(\frac{14}{21}\)[/tex] are:

[tex]\[
\frac{10}{21}, \frac{11}{21}, \frac{12}{21}
\][/tex]



Answer :

Certainly! Let's go through each part of the question step-by-step.

### Section D

#### Part (i): Find three rational numbers between [tex]\( \frac{3}{7} \)[/tex] and [tex]\( \frac{2}{3} \)[/tex].

To find three rational numbers between [tex]\( \frac{3}{7} \)[/tex] and [tex]\( \frac{2}{3} \)[/tex], we first convert these fractions to equivalent fractions with a common denominator. The least common multiple (LCM) of 7 and 3 is 21. Therefore, we have:

[tex]\[ \frac{3}{7} = \frac{3 \times 3}{7 \times 3} = \frac{9}{21} \][/tex]
[tex]\[ \frac{2}{3} = \frac{2 \times 7}{3 \times 7} = \frac{14}{21} \][/tex]

Now we need to find three rational numbers between [tex]\(\frac{9}{21}\)[/tex] and [tex]\(\frac{14}{21}\)[/tex]. These could be:

[tex]\[ \frac{10}{21}, \frac{11}{21}, \frac{12}{21} \][/tex]

However, the actual rational numbers between [tex]\( \frac{3}{7} \)[/tex] and [tex]\( \frac{2}{3} \)[/tex] are slightly different:

[tex]\[ 0.47619047619047616, 0.5238095238095238, 0.5714285714285714, 0.6190476190476191 \][/tex]

#### Part (ii): Find the sum of [tex]\( \frac{3}{7} + \left(-\frac{6}{11}\right) + \left(-\frac{8}{21}\right) + \frac{5}{22} \)[/tex].

Given the fractions:

[tex]\[ \frac{3}{7}, -\frac{6}{11}, -\frac{8}{21}, \frac{5}{22} \][/tex]

Adding these fractions together:

[tex]\[ \frac{3}{7} + \left(-\frac{6}{11}\right) + \left(-\frac{8}{21}\right) + \frac{5}{22} = -0.27056277056277056 \][/tex]

#### Part (iii): Represent [tex]\( -\frac{2}{11}, -\frac{5}{11}, -\frac{9}{11} \)[/tex] on the number line.

The respective decimal representations are:

[tex]\[ -\frac{2}{11} = -0.18181818181818182 \][/tex]
[tex]\[ -\frac{5}{11} = -0.45454545454545453 \][/tex]
[tex]\[ -\frac{9}{11} = -0.8181818181818182 \][/tex]

These values can thus be placed on the number line as such:

[tex]\[ -0.1818, -0.4545, -0.8181 \][/tex]

#### Part (iv): What should be added to [tex]\( -\frac{16}{3} \)[/tex] to make it [tex]\( \frac{1}{9} \)[/tex]?

To find what should be added to [tex]\( -\frac{16}{3} \)[/tex] to get [tex]\( \frac{1}{9} \)[/tex]:

[tex]\[ \text{Let the number to be added be } x. \\ \text{So, } -\frac{16}{3} + x = \frac{1}{9} \\ x = \frac{1}{9} - \left(-\frac{16}{3}\right) = \frac{1}{9} + \frac{16}{3} \][/tex]

Solving this:

[tex]\[ x = 5.444444444444444 \][/tex]

#### Part (v): What is the additive inverse of [tex]\( \frac{3}{5} \)[/tex]?

The additive inverse of a number is the number that, when added to the original number, results in zero.

The additive inverse of [tex]\( \frac{3}{5} \)[/tex] is:

[tex]\[ -\frac{3}{5} = -0.6 \][/tex]

### Summary of Results

[tex]\[ \begin{array}{l} \text{(i) Three rational numbers between } \frac{3}{7} \text{ and } \frac{2}{3} \text{ are:} \\ 0.47619047619047616, 0.5238095238095238, 0.5714285714285714, 0.6190476190476191 \\ \text{(ii) The sum of the given rational numbers is:} \\ -0.27056277056277056 \\ \text{(iii) Representation of } -\frac{2}{11}, -\frac{5}{11}, -\frac{9}{11} \text{ on the number line is:} \\ -0.18181818181818182, -0.45454545454545453, -0.8181818181818182 \\ \text{(iv) Number to be added to } -\frac{16}{3} \text{ to make it } \frac{1}{9} \text{ is:} \\ 5.444444444444444 \\ \text{(v) The additive inverse of } \frac{3}{5} \text{ is:} \\ -0.6 \end{array} \][/tex]