Numbers of Any Magnitude

Scientific Notation

100

TRUE/FALSE: The width of DNA is approximately

2.5 × 10^9  metres

FALSE: 

2.5 × 10^-9  metres

200

What is 35000 written in scientific notation?

3.5 x 10⁴

300

What is 0.425 written in scientific notation?

4.25 x 10^-1

400

What is 5.98 x 10⁶ as a basic numeral?

5 980 000

500

What is 456000 in scientific notation, correct to 2 significant figures?

4.6 x 10⁵

Significant Figures

100

What is the first significant figure in 0.003056?

3

200

How many significant figures are in 3456000 ?

4

300

Round 12 456 789 to 3 significant figures

12 500 000

400

Round 35.0867 to 3 significant figures

35.1

500

What is the following correct to 3 significant figures

(2 times 10^10)/(3.67 times 10^5)

54 500

Conversions

100

Convert 3.56 m to cm

356 cm

200

Convert 2.34 km to cm

234 000 cm

300

How many kg are in 876500 mg?

0.8765 kg

400

Convert 5 ML to L

5 000 000 L

500

How many seconds in a year? (answer in scientific notation, correct to 2 significant figures)

31536000

3.15 x10⁷

Limits of Accuracy

100

TRUE/FALSE (explain your answer): All measurements are always exact. 

FALSE: All measurements are approximate. Errors come from the equipment being used or the person using it. We can only measure an object to the level of accuracy of the measuring units scale. 

200

A piece of timber is measured to be 86 cm. What is the smallest unit of measurement?

1 cm

300

The area of a room is needed to order floor tiles. The room dimensions, 2.49 m by 4.31 m, were rounded to 2 m and 4 m to calculate the answers. What problems might arise?

The area of the room contains error and therefore the builder will potentially not order enough tiles to cover the space. 

400

The length of a table is 105 cm, correct to the nearest centimetre. The greatest error in this is:

 ± 0.5 cm

500

The distance between the Sun and Earth is 150,000,000 km, correct to 2 significant figures. What is the lower limit?

145 000 000 km

Random Riddles

100

What has to be broken before you can use it?

An egg

200

What goes up by never comes down?

Your age

300

No matter what, what can you always count on?

Your fingers

400

What is full of holes but still holds water?

A sponge

500

I am an odd number. Take away one letter and I become even. What number am I?

Seven