Decimals (Multiplication)：練習問題

A small bottle of essential oil has a capacity of \( 0.015 \) L. If a retailer orders \( 250 \) bottles, what is the total volume of essential oil in litres?

A stack of 80 identical commemorative coins is formed. If each coin has a thickness of \(0.175\) cm, what is the total height of the stack in centimetres?

Estimate the result of \(4.8 \times 3.25\) by rounding each number to its nearest whole number. What is the difference between the actual product and the estimated product?

Calculate the product of \( 0.42 \) and \( 0.6 \).

A rectangular card is \(12.5\) cm long and \(8.4\) cm wide. What is the area of the card in square centimetres?

Calculate \(0.58 \times 1000\).

A car's fuel consumption is \(0.08\) litres of petrol for every kilometre travelled. If the price of petrol is \(\$16.50\) per litre, calculate the total cost of petrol for a journey of \(25\) kilometres.

A factory produces \(500\) kg of flour. Each large container is filled with \(0.01\) times the total production. If the flour in one large container is then divided into 4 equal sample packets, how many kilograms of flour are in each sample packet?

A baker uses \(0.35 \text{ kg}\) of flour to make one cake.

a) How many kilograms of flour are needed to make \(8\) such cakes?

b) If the baker has a bag containing \(5 \text{ kg}\) of flour, how many kilograms of flour will be left after making the \(8\) cakes?

A painter is commissioned to paint a rectangular feature wall. The wall measures \(4.75\) m in length and \(3.2\) m in height.

a) Calculate the area of the wall in square metres.

b) If one litre of specialized paint covers \(6.5\) m\(^2\), calculate the area that can be covered by \(2.5\) litres of paint.

c) Based on your answers above, is \(2.5\) litres of paint sufficient to cover the entire wall? Show your reasoning.