Numbers, lower and upper bounds and ratio

The distance from the Earth to the Sun is 151000000 km.

This number in standard form is

3/5 of the students in a class walk to school.  1/4 of the students come by car. The rest travel by bus. Calculate the ratio of students who:

                                                           walk : come by car : travel by bus

Give your answer in its simplest form.

•  12/20 : 5/20 : 3/20

• 3 : 1 : 6

• 12 : 5 : 3

• 12/12 : 4/12 : 3/12

Square A has sides of length 0.2 m.Square B has sides of length 1.2 m.

Write the ratio of  area of square A : area of square B in its simplest form.

 

• 12 : 2

• 2 : 12

• 0.2 : 1.2

• 1 : 36

On a farm there are goats and sheep. There are 75 more goats than sheep. The ratio of goats : sheep is 7 : 2. Calculate the total number of animals on the farm.

• 9

• 135

• 675

• 200

A sheet of paper has a thickness of 0.5 mm, correct to one decimal place.

A pile of this papers is 30 cm high, correct to the nearest millimetre.

Calculate the upper bound for the number of sheets of paper in this pile. Write your answer as an interger number.

• 668

• 667

• 600

• 600.5

A coffee machine dispenses 200 ml of coffee to the nearest 10 ml. It then adds 20 ml of milk, to the nearest 5 ml. Which of the following are the lower and upper boundaries for the amount dispensed?

• 205≤V<235

• 212.5≤V<227.5

• 210≤V<220

• 212.5≤V<227.4

Which of the following is 0.01002302 correct to 3 significant figures?

• 0.0100

• 0.01

• 0.010

• 0.010023

Write 38.97 to 1 decimal place

• 39.0

• 39

• 38.9

• 40.0

Write 2139 to 3 significant figures.

• 213

• 2140

• 214

• 2130

• x=1

• x=0

• x=2

• x=3