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Circles

100

What is the area of a circle with a radius of 5cm? (2 decimal places)

78.54cm²

200

What is the area of a circle with a radius of 8.3cm? (2 decimal places)

216.42cm²

300

What is the area of a circle with a diamater of 6cm? (2 decimal places)

28.27cm²

400

What is the radius of a circle with an area of 3.14cm²?

1cm

500

What is the radius of a circle with an area of 201.06cm²?

8cm

Rounding

100

Round 5410 to 2 significant figures

5400

200

How many significant figures in 0.00362?

3

300

Round 3.86296 to 3 decimal places

3.863

400

How many significant figures in 40,000.1

6

500

Round 20,408 to 1 significant figure

20,000

Rational numbers

100

Is 5 a rational number?

Yes

200

Is the square root of 18 rational?

No

300

Is the square root of 81 rational?

Yes

400

Is pi (3.1415...) rational?

No

500

Which one of these is rational:

Square root of 14

Square root of 64

Square root of 104

Square root of 64