# Math questions

This is a list of recently added questions about math.## Which famous scientist was born on the Pi day? (March 14)

Albert Einstein. 14 of March is celebrated on many schools and universities as both Pi Day and the birthday of Albert Einstein. On of the traditions is the 'Pi Pie' (pictured).

Created by: globalquiz.org

hard

47%

Albert Einstein

Albert Einstein

3688

Blaise Pascal

Blaise Pascal

1337

Isaac Newton

Isaac Newton

1362

all of the above

all of the above

1331

## Which of the following is a prime number?

16769023. A prime number has no positive divisors other than 1 and itself. Hence, a prime bigger than 2 cannot be even. All prime numbers bigger than 5, written in the usual decimal system, end in 1, 3, 7, or 9.

Created by: Sumit Tamang

average

66%

23882990

23882990

918

16769023

16769023

6596

38377296

38377296

848

11723835

11723835

1617

## Let's say the stock price was 10 two days ago. It has dropped by 50% yesterday and raised by 50% today. What is the stock price now?

7.5. Stock price was 10 two days ago. Yesterday it dropped by 50% to 5. Today it raised by 50% (of 5) to 7.5

Created by: globalquiz.org

easy

71%

10

10

938

12.5

12.5

734

7.5

7.5

4523

20

20

144

## How many possible code combinations are there for this kind of lock?

10000. The possible codes are from 0000 to 9999 inclusive.

Created by: Teddy

hard

50%

999

999

420

1000

1000

555

9999

9999

2982

10000

10000

4105

## If Earth's radius was larger by 1 meter, how much longer would its equator be?

By approx 6 meters. For each circle, the length of the circumference is c=2πr. Hence, if a radius grows by 1 meter, the circumference grows by 2 π meters - no matter what the initial value of radius was.

Created by: SpikeMe

hard

43%

by approx 6 meters

by approx 6 meters

5339

by approx 6 kilometers

by approx 6 kilometers

2187

by approx 60 kilometers

by approx 60 kilometers

2696

by approx 6000 kilometers

by approx 6000 kilometers

2161

## How many edges does a cube have?

12. A cube has six square faces, each of which has four edges - but each edge is shared with another face.

Created by: globalquiz.org

easy

78%

4

4

172

8

8

1039

12

12

8296

16

16

1025

## How many edges does a Möbius strip have?

One. The Möbius strip is a surface with only one side and only one boundary component (edge). A line drawn starting from the seam down the middle will meet back at the seam but at the "other side". If continued the line will meet the starting point and will be double the length of the original strip.

Created by: globalquiz.org

easy

73%

one

one

7431

two

two

1868

three

three

473

four

four

387

## Typically, how many leap years are in a century?

24. The Gregorian Calendar omits 3 leap days every 400 years, omitting February 29 in the 3 century years (integer multiples of 100) that are not also integer multiples of 400. For example, 1600 was a leap year, but 1700, 1800 and 1900 were not. Similarly, 2000 was a leap year, but 2100, 2200, and 2300 will not be.

Created by: ex-terminator

hard

43%

20

20

888

24

24

3891

25

25

3827

100

100

414

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