Working with Fractions | IT

Question 3

When do you think the quotient is less than the dividend and when is it greater than the dividend?

Is there a similar relationship between the divisor and the quotient?

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Solution
Understand the Question
  • In any division problem: Dividend÷Divisor=Quotient\text{Dividend} \div \text{Divisor} = \text{Quotient}, or DividendDivisor=Quotient\dfrac{\text{Dividend}}{\text{Divisor}} = \text{Quotient}.
  • For positive numbers, the relationship between the quotient and the dividend depends entirely on the size of the divisor:
    • Dividing by a number greater than 11 splits the dividend into smaller parts, making the quotient smaller.
    • Dividing by a number between 00 and 11 (a proper fraction) scales the dividend up, making the quotient larger.
    • Dividing by 11 leaves the dividend unchanged.

(i) When do you think the quotient is less than the dividend and when is it greater than the dividend?

Step 1 · Compare Quotient to Dividend for Different Divisors

Let Dividend=D\text{Dividend} = D, Divisor=d\text{Divisor} = d, and Quotient=q\text{Quotient} = q, where q=D÷dq = D \div d.

Case 1: Divisor is equal to 11 (d=1d = 1) 5÷1=55 \div 1 = 5 35÷1=35\dfrac{3}{5} \div 1 = \dfrac{3}{5} When the divisor is 11, the quotient is equal to the dividend.

Case 2: Divisor is greater than 11 (d>1d > 1) 10÷2=5(5<10)10 \div 2 = 5 \quad (5 < 10) 15÷2=15×12=110(110<15)\begin{aligned} \dfrac{1}{5} \div 2 &= \dfrac{1}{5} \times \dfrac{1}{2} \\[0.6em] &= \dfrac{1}{10} \quad \left(\dfrac{1}{10} < \dfrac{1}{5}\right) \end{aligned} When the divisor is greater than 11, the quotient is less than the dividend.

Case 3: Divisor is between 00 and 11 (0<d<10 < d < 1) 10÷12=10×21=20(20>10)\begin{aligned} 10 \div \dfrac{1}{2} &= 10 \times \dfrac{2}{1} \\[0.6em] &= 20 \quad (20 > 10) \end{aligned} 12÷13=12×31=32=112(112>12)\begin{aligned} \dfrac{1}{2} \div \dfrac{1}{3} &= \dfrac{1}{2} \times \dfrac{3}{1} \\[0.6em] &= \dfrac{3}{2} = 1\dfrac{1}{2} \quad \left(1\dfrac{1}{2} > \dfrac{1}{2}\right) \end{aligned} When the divisor is between 00 and 11, the quotient is greater than the dividend.

Answer

(i) * The quotient is less than the dividend when the divisor is greater than 11.

  • The quotient is greater than the dividend when the divisor is between 00 and 11.
  • The quotient is equal to the dividend when the divisor is equal to 11.

(ii) Is there a similar relationship between the divisor and the quotient?

Step 1 · Compare Divisor and Quotient Across Examples

Test the relationship between divisor and quotient across different examples:

  • 10÷2=5    Divisor (2)<Quotient (5)10 \div 2 = 5 \implies \text{Divisor } (2) < \text{Quotient } (5)
  • 10÷5=2    Divisor (5)>Quotient (2)10 \div 5 = 2 \implies \text{Divisor } (5) > \text{Quotient } (2)
  • 4÷2=2    Divisor (2)=Quotient (2)4 \div 2 = 2 \implies \text{Divisor } (2) = \text{Quotient } (2)
  • 1÷12=2    Divisor (12)<Quotient (2)1 \div \dfrac{1}{2} = 2 \implies \text{Divisor } \left(\dfrac{1}{2}\right) < \text{Quotient } (2)
  • 14÷12=12    Divisor (12)=Quotient (12)\dfrac{1}{4} \div \dfrac{1}{2} = \dfrac{1}{2} \implies \text{Divisor } \left(\dfrac{1}{2}\right) = \text{Quotient } \left(\dfrac{1}{2}\right)

The divisor can be less than, greater than, or equal to the quotient depending entirely on the dividend.

Answer

(ii) No, there is no similar direct relationship between the divisor and the quotient because their comparison depends on the value of the dividend.

Common Mistakes
  • Assuming Division Always Shrinks: Believing division always produces a smaller number. Dividing by a proper fraction (a number between 00 and 11) increases the value.
  • Overlooking the Dividend: Trying to establish a direct rule between divisor and quotient without accounting for the dividend (extDivisor×Quotient=Dividend ext{Divisor} \times \text{Quotient} = \text{Dividend}).

More questions in IT

Q1

Context: In Fig. 8.3, the length and breadth of the shaded rectangle are 12\dfrac{1}{2} unit and 14\dfrac{1}{4} unit, and its area is 18\dfrac{1}{8} square units.

Q. Do you see any relation between the area and the product of length and breadth?

Q2

In each of the division problems above, observe how we found the answer. Can we frame a rule that tells us how to divide two fractions?

Q3

When do you think the quotient is less than the dividend and when is it greater than the dividend?

Is there a similar relationship between the divisor and the quotient?

Q4

In each of the figures given below, find the fraction of the big square that the shaded region occupies.

Q5

Context: If we assume 1 gold dinar = 12 silver drammas, 1 silver dramma = 4 copper panas, 1 copper pana = 6 mashakas, and 1 pana = 30 cowrie shells,

Given: 1 copper pana = 148\dfrac{1}{48} gold dinar (112×14)\left(\dfrac{1}{12} \times \dfrac{1}{4}\right)

Fill in the blanks:

(i) 1 cowrie shell = ______ copper panas

(ii) 1 cowrie shell = ______ gold dinar.

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