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# ML Aggarwal Class 9 Chapter 1 Solutions

Tanusri S.
17 Mar 0 0

## 1. Insertion Between 2/9 and 3/8, Descending Order:

To insert a rational number between 2/9 and 3/8 while arranging them in descending order, we turn to the LCM method to ensure a common denominator for these fractions.

• LCM of 9 and 8: The LCM of the denominators 9 and 8 is 72. This common denominator guarantees that the fractions share the same base for further calculations.
• Equivalent fractions: We convert both fractions to their equivalent forms with a common denominator of 72:
• 2/9 = (2/9) * (8/8) = 16/72
• 3/8 = (3/8) * (9/9) = 27/72
• Insertion calculation: Since we want to insert a rational number between these two fractions, we consider the average of 16/72 and 27/72: (16/72 + 27/72) / 2 = 43/72.
• Descending order: Arranging them in descending order, we get 27/72, 43/72, and 16/72.

## 2. Pairing Between 1/3 and 1/4, Ascending Order:

Inserting rational numbers between 1/3 and 1/4 while arranging in ascending order requires finding a common denominator through the LCM method.

• LCM of 3 and 4: The LCM of the denominators 3 and 4 is 12.
• Equivalent fractions: We convert both fractions to equivalent forms with a common denominator of 12:
• 1/3 = (1/3) * (4/4) = 4/12
• 1/4 = (1/4) * (3/3) = 3/12
• Insertion calculation: To insert rational numbers, we use a common difference between fractions. In this case, the difference is 1/12 (12 divided by 12).
• Insertion and arrangement: Adding 1/12 and then 2/12 (simplified as 1/6) to 4/12 gives us the sequence 4/12, 5/12, 6/12 (or 1/3), 7/12, 8/12 (or 2/3), 9/12 (or 3/4).

## 3. Inclusion Between -1/3 and -1/2, Ascending Order:

Incorporating rational numbers between -1/3 and -1/2 while arranging in ascending order calls for the LCM technique to find a common denominator.

• LCM of 3 and 2: The LCM of the denominators 3 and 2 is 6.
• Equivalent fractions: We convert both fractions to equivalent forms with a common denominator of 6:
• -1/3 = (-1/3) * (2/2) = -2/6
• -1/2 = (-1/2) * (3/3) = -3/6
• Insertion calculation: Similar to the previous question, we insert rational numbers using a common difference, which is 1/6 (6 divided by 6).
• Insertion and arrangement: Adding 1/6 and then 2/6 (simplified as 1/3) to -2/6 gives us the sequence -2/6, -5/6, -8/6 (or -1/2).

4. Filling Between 1/3 and 4/5, Descending Order:

Filling rational numbers between 1/3 and 4/5 while arranging them in descending order requires establishing a common denominator through LCM.

• LCM of 3 and 5: The LCM of the denominators 3 and 5 is 15.
• Equivalent fractions: We convert both fractions to equivalent forms with a common denominator of 15:
• 1/3 = (1/3) * (5/5) = 5/15
• 4/5 = (4/5) * (3/3) = 12/15
• Insertion calculation: Once again, we insert rational numbers using a common difference, which is 1/15 (15 divided by 15).
• Insertion and arrangement: Adding 1/15, then 2/15, and finally 3/15 (or 1/5) successively to 5/15 (or 1/3) gives us the sequence 5/15, 6/15 (or 2/5), 7/15, 8/15, 9/15 (or 3/5), 10/15 (or 2/3), 11/15, 12/15 (or 4/5).

## 5. Intervals Between 4 and 4.5:

The task here is to insert rational numbers between 4 and 4.5 using equal intervals.

• Intervals: The difference between 4 and 4.5 is 0.5. To divide this range into 3 intervals, we use 0.5 / 3 = 0.166… (repeating decimal).
• Insertion and arrangement: Adding 0.166… successively to 4 gives us the sequence 4, 4.166…, 4.333…, and finally 4.5.

## 6. Navigating Between 3 and 4:

To navigate between 3 and 4 while inserting rational numbers and arranging them, we use the LCM method to establish common intervals.

• Intervals: The difference between 3 and 4 is 1. To divide this range into 6 intervals, we use 1 / 6 = 1/6.
• Insertion and arrangement: Adding 1/6 successively to 3 gives us the sequence 3, 13/6, 7/3, 5/2, 17/6, and finally 4.

7. Bridging Between 3/5 and 4/5:

To bridge rational numbers between 3/5 and 4/5 while arranging them, we once again use the LCM technique for common intervals.

• LCM of 5: The LCM of the denominator 5 is 5.
• Equivalent fractions: We convert both fractions to equivalent forms with a common denominator of 5:
• 3/5 = (3/5) * (1/1) = 3/5
• 4/5 = (4/5) * (1/1) = 4/5
• Intervals: The difference between 4/5 and 3/5 is 1/5. To divide this range into 5 intervals, we use 1/5 / 5 = 1/25.
• Insertion and arrangement: Adding 1/25 successively to 3/5 gives us the sequence 3/5, 11/25, 13/25, 21/25, and finally 4/5.

## 8. Discovery Amidst -2/5 and 1/7:

In this complex scenario, discovering rational numbers between -2/5 and 1/7 while arranging them requires careful application of the LCM approach.

• LCM of 5 and 7: The LCM of the denominators 5 and 7 is 35.
• Equivalent fractions: We convert both fractions to equivalent forms with a common denominator of 35:
• -2/5 = (-2/5) * (7/7) = -14/35
• 1/7 = (1/7) * (5/5) = 5/35
• Intervals: The difference between 5/35 and -14/35 is 19/35. To divide this range into 11 intervals, we use 19/35 / 11 = 19/385.
• Insertion and arrangement: Adding 19/385 successively to -14/35 gives us the sequence -14/35, -33/385, -14/77, -7/55, -4/35, -33/385, -14/105, -5/77, -2/35, -19/385, and finally 5/35.

9. Journeying Between 1/2 and 2/3:

The final task is to journey between 1/2 and 2/3 by inserting rational numbers and arranging them.

• LCM of 2 and 3: The LCM of the denominators 2 and 3 is 6.
• Equivalent fractions: We convert both fractions to equivalent forms with a common denominator of 6:
• 1/2 = (1/2) * (3/3) = 3/6
• 2/3 = (2/3) * (2/2) = 4/6
• Intervals: The difference between 4/6 and 3/6 is 1/6. To divide this range into 6 intervals, we use 1/6.
• Insertion and arrangement: Adding 1/6 successively to 3/6 gives us the sequence 3/6, 4/6, 5/6.
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