Working with Fractions | IT

Question 1

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

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

Question diagram 1
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Solution

We will check if the area is the product of length and breadth.

Step 1 — Note the dimensions

The problem gives us the length. Let the length be L. L=12 unitL = \frac{1}{2} \text{ unit}

The problem also gives us the breadth. Let the breadth be B. B=14 unitB = \frac{1}{4} \text{ unit}

The problem states the area. Let the area be A. A=18 square unitsA = \frac{1}{8} \text{ square units}

Diagram 1

Step 2 — Calculate the product

Let us multiply the length and breadth. This is L×BL \times B. L×B=12×14L \times B = \frac{1}{2} \times \frac{1}{4}

We multiply the numerators. We multiply the denominators. L×B=1×12×4L \times B = \frac{1 \times 1}{2 \times 4}

L×B=18L \times B = \frac{1}{8}

18 square units\boxed{\frac{1}{8} \text{ square units}}

Step 3 — Compare the values

We found the product of length and breadth. The product is 18\frac{1}{8} square units. The problem states the area is 18\frac{1}{8} square units. Both values are the same.

Answer

Yes, the area is equal to the product of length and breadth.

More questions in IT

Q1

Context: In Fig. 8.3, the length and breadth of the shaded rectangle are 12\frac{1}{2} unit and 14\frac{1}{4} unit, and its area is 18\frac{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\frac{1}{48} gold dinar (112×14)\left(\frac{1}{12} \times \frac{1}{4}\right)

Fill in the blanks:

(i) 1 cowrie shell = ______ copper panas

(ii) 1 cowrie shell = ______ gold dinar.

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