Page 59 - Start Up Mathematics_7

6. A vehicle covers a distance of 176.96 km in 14 litres of petrol. What is the average distance
covered per litre?
7. How many ice cream cones can be filled from 10.5 litres of ice cream, if one cone can be
filled with 35 mL of ice cream?
8. If the cost of a dozen showpieces is ` 276.60, what will be the cost of one showpiece?

9. Each side of a regular polygon measures 3.2 cm. Find the number of sides of the polygon
if its perimeter is 19.2 cm.

Group Project

Plug in the Missing Decimals

1. Fill in the blanks on the LHS of the equations (i) to (iv) using the decimal numbers given
below.
0.4 2.8 3.4 7.6 8.1 9.4

Note: Each decimal number is to be used only once.
2. Perform the required operations by filling the blanks from decimal numbers given above
in as many different ways as possible. Write the answers in the boxes given on RHS and
find their sum.

________ + ________ = Equation (i)

________ ÷ 5 = Equation (ii)

________ × ________ = Equation (iii)

12 ÷ ________ = ________ Equation (iv)

Total = ________
Discuss and answer the following questions:
(a) What is the sum of the numbers obtained in the boxes in the above equations?
(b) Can the total be greater than 100, 115, 120?

(c) Can the total be less than 15, 10?
* Check your answers with other students of the class and find who has got the greatest and
the smallest sum.

Reason It Out!

1. Evaluate 0.45 × 0.12 in two ways: first by the rules we have learnt and then using a
calculator. Compare the position of the decimal in both cases. Is it different? Why or
why not?

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