Round off 0.016668 correct to three significant figures.

Insert brackets ( ) to the statement below to make it a correct statement.

5 x 7 - 3 - 6 = 14

Arrange $$\frac{21}{50}$$  , 0.4 and $$\frac{9}{20}$$   in descending order.

Express 87.5% as a decimal.

Express 87.5% as a fraction in its lowest term.

Evaluate the following:

$$58\div0.07$$  

Evaluate the following:

$$\left[\left(100\div5+6\right)\times4\right]-20$$  

A box contains red and blue balls in the ratio 3 : 7.

There are 18 red balls in the box.

How many balls are there in the box altogether?

Find the L.C.M of 12, 18 and 30.

Factorise 3xy - x.

Find the sum of perfect squares between 20 and 40.

Find the value of x and y in the expression below:

$$\frac{2}{10}+\frac{x}{y}+\frac{2}{1000}=0.242$$  

A factory produces 660 cupcakes in an hour.

How many cupcakes will it produce in 8 minutes?

Mrs Wong has 900 grams of flour. She uses $$\frac{7}{12}$$  of the flour to bake biscuits.

How many grams of flour does she have left?

The table shows the temperature of 5 cities on a particular day.

Which city had the lowest temperature?

What was the difference in temperature between Tokyo and Seoul?

What was the average temperature of the 5 cities?

The temperature in Busan is $$4\degree C$$ higher than that in Seoul. What is the temperature in Busan?