1. Sub. :- Mathematics Unitary Method Std. :- 5 th Chapter no. 4

2. No. of PensCost Of Pens Rs. 210 420 840 1680 Observe the table given below. The cost of pen increase as the no. of pens increases. And if the no. of pens is double, cost of pens is also doubles.

3. No. of PensCost Of Pens Rs. 1680 840 420 210 Observe the table given below. The cost of pen reduces as the no. of pens reduces.

4. Example : The cost of 5 pens is Rs. 25, what is a cost of 10 pens? The cost of 5 pens is Rs. 25... (... (Therefore) the cost of 1 pen is= 25 ÷ 5 = Rs. 5... (... (Therefore) the cost of 10 pen is = 10 x 5 = Rs. 50 Therefore the cost of 10 pen is Rs. 50

5. Finding out the value of one from many and then the value of many from the one is called the unitary method. Unitary Method

6. Example : The cost of 3 plates is Rs. 69, what is a price of 8 such plates? The cost of 3 plates is Rs. 69... (... (Therefore ) the price of 1 plate is= 69 ÷ 3 = Rs. 23... (... (Therefore) the cost of 8 plates is = 23 x 8 = Rs. 184 Therefore the cost of 8 plates is Rs. 184

7. 1)The cost of 6 notebooks is Rs. 72, find the cost of 4 notebooks. 2)If the cost of 7 liters of milk is Rs 140, find the cost of 4 liters of milk. Exercise :