# 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

46%

Albert Einstein

Albert Einstein

6248

Blaise Pascal

Blaise Pascal

2470

Isaac Newton

Isaac Newton

2245

all of the above

all of the above

2390

## 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

67%

23882990

23882990

1717

16769023

16769023

12600

38377296

38377296

1608

11723835

11723835

2789

## 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

74%

10

10

1886

12.5

12.5

1528

7.5

7.5

10872

20

20

287

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

10000. The possible codes are from 0000 to 9999 inclusive. There are 10 possibilities for each ring, thus there are 10*10*10*10 possible codes.

Created by: Teddy

hard

53%

999

999

653

1000

1000

958

9999

9999

5379

10000

10000

7901

## 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

46%

by approx 6 meters

by approx 6 meters

14067

by approx 6 kilometers

by approx 6 kilometers

5440

by approx 60 kilometers

by approx 60 kilometers

6327

by approx 6000 kilometers

by approx 6000 kilometers

4673

## 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

72%

one

one

12575

two

two

3265

three

three

796

four

four

618

## 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

42%

20

20

1485

24

24

6931

25

25

7202

100

100

655

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