# Math Is Fun Forum

Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

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## #1 2006-09-20 04:08:52

Jai Ganesh
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Registered: 2005-06-28
Posts: 45,494

### 10 second questions

(1) Is 1298045602 a perfect square?

(2) Is 6719247 a prime number?

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #2 2006-09-20 04:15:35

Jai Ganesh
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Registered: 2005-06-28
Posts: 45,494

### Re: 10 second questions

(3) How many times would you have to write the number 6 when you write from 1 to 100?

(4) A bus contains 23 men and 14 women. In the first stop after the start, 11 men board and 2 women do. In the next stop, 6 men board and 3 women do. In the next, 2 men alight and 2 women do, but also 2 men board the bus and 2 women do. The question is, how many places did the bust stop from the start to the destination? (You are granted 20 seconds for this, as a special case!)

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #3 2006-09-20 04:26:07

Devantè
Real Member
Registered: 2006-07-14
Posts: 6,400

### Re: 10 second questions

Great to have you back, Ganesh.

1. No
2. No
3. 10? Unless it's a trick question
4. 3, not counting the start.

EDIT: Wait - I think number 4 was a trick question. You didn't specify that there was a destination - So I don't think there is way of knowing, without saying that the third stop was the destination.

Last edited by Devanté (2006-09-20 04:32:05)

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## #4 2006-09-20 04:31:02

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,494

### Re: 10 second questions

Hi Devante, and thanks, a big thanks for the welcome back message.
Your answers 1, 2, and 4 are absolutely right. 3.....think again....how many times would you have to write the number 6 from 60 to 66 alone ?

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #5 2006-09-20 04:33:23

Devantè
Real Member
Registered: 2006-07-14
Posts: 6,400

### Re: 10 second questions

Oh...I see.

6, 16, 26, 36, 46, 56, 60, 66, 76, 86, 96.

I think that's all of them...

I think 11.

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## #6 2006-09-20 05:40:35

pi man
Member
Registered: 2006-07-06
Posts: 251

### Re: 10 second questions

got to include all of the sixty's:

6, 16, 26, 36, 46, 56, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 76, 86, 96.  That's 20 (there's two in 66).

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## #7 2006-09-20 05:48:38

espeon
Real Member
Registered: 2006-02-05
Posts: 2,586

### Re: 10 second questions

is 3. 14 or 16?

Presenting the Prinny dance.
Take this dood! Huh doood!!! HUH DOOOOD!?!? DOOD HUH!!!!!! DOOOOOOOOOOOOOOOOOOOOOOOOOD!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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## #8 2006-09-20 05:49:56

espeon
Real Member
Registered: 2006-02-05
Posts: 2,586

### Re: 10 second questions

o its 11

Presenting the Prinny dance.
Take this dood! Huh doood!!! HUH DOOOOD!?!? DOOD HUH!!!!!! DOOOOOOOOOOOOOOOOOOOOOOOOOD!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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## #9 2006-09-20 06:44:26

Devantè
Real Member
Registered: 2006-07-14
Posts: 6,400

### Re: 10 second questions

Thanks pi man. I stand corrected.

See pi man's post, Espeon.

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## #10 2006-09-20 16:28:43

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,494

### Re: 10 second questions

(5) In the realm of whole numbers, apart from zero and one, which the smallest number which is both a perfect square and a perfect cube?

(6) What is the angle between the hands of a clock when the time is 8.00?

(7) What is the side total of a 3X3 magic square with numbers from 1 to 9?

(8) How many zeros does a trillion (US) contain?

(9) What are the common factors of 111, 222, 333, 444, 555, 666, 777, 888, and 999? (Four of them)

(10) How many furlongs is a mile?

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #11 2006-09-20 16:53:51

justlookingforthemoment
Moderator
Registered: 2005-05-26
Posts: 2,161

### Re: 10 second questions

5) 64
6) 240°
7) 15
8) 12 (alternatively, 'a trillion (US)' contains no zeros)
9) 1, 3, 37, 111
10) 8

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## #12 2006-09-21 04:39:59

Devantè
Real Member
Registered: 2006-07-14
Posts: 6,400

### Re: 10 second questions

5. 64
6. 240 degrees
7. 15
8. 12 - And in the UK it is 18.
9. 1, 3, 37, 111
10. 8

I'll check my answers when I have time, I'm pretty sure one of my answers doesn't look right.

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## #13 2006-09-22 16:20:29

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,494

### Re: 10 second questions

Great, Devante` and justlookingforthemoment, your replies are all correct

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #14 2006-09-22 18:06:37

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,494

### Re: 10 second questions

11. What is so special about the number 2.7182818284.... to mathematicians?

12. How many nano seconds is a second?

13. Which number has got the highest probability of being displayed when a pair of dice is cast?

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #15 2006-09-22 20:06:28

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,494

### Re: 10 second questions

14. How many seconds is an hour?

15. How many digits is 22/7 a correct aprroximation of pi?

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #16 2006-09-22 20:36:53

justlookingforthemoment
Moderator
Registered: 2005-05-26
Posts: 2,161

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## #17 2006-09-23 00:06:32

espeon
Real Member
Registered: 2006-02-05
Posts: 2,586

### Re: 10 second questions

14. 60x60=3600 seconds
12.100?

Last edited by espeon (2006-09-23 00:07:31)

Presenting the Prinny dance.
Take this dood! Huh doood!!! HUH DOOOOD!?!? DOOD HUH!!!!!! DOOOOOOOOOOOOOOOOOOOOOOOOOD!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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## #18 2006-09-24 04:06:32

Devantè
Real Member
Registered: 2006-07-14
Posts: 6,400

### Re: 10 second questions

I'll count the nanosecond noughts afterwards.

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## #19 2006-09-26 20:57:35

Jai Ganesh
Administrator
Registered: 2005-06-28
Posts: 45,494

### Re: 10 second questions

Excellent, all of you, Devante', jl, espeon.

16. How many prime numbers are there from 1 to 100?

17. How many numbers, including 7, are divisible by 7 from 1 to 100?

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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## #20 2006-09-27 06:42:41

Devantè
Real Member
Registered: 2006-07-14
Posts: 6,400

### Re: 10 second questions

16. 25, obviously not counting 1.

17. 14? This is probably like the one with the sixes.

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## #21 2006-09-27 06:44:29

Devantè
Real Member
Registered: 2006-07-14
Posts: 6,400

### Re: 10 second questions

I read justlookingforthemoment's answers after Ganesh told us that we were correct (and Espeon).

It's e not e!.

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## #22 2006-09-27 07:28:13

espeon
Real Member
Registered: 2006-02-05
Posts: 2,586

### Re: 10 second questions

yay?

Presenting the Prinny dance.
Take this dood! Huh doood!!! HUH DOOOOD!?!? DOOD HUH!!!!!! DOOOOOOOOOOOOOOOOOOOOOOOOOD!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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## #23 2006-09-27 08:04:23

Devantè
Real Member
Registered: 2006-07-14
Posts: 6,400

### Re: 10 second questions

Remember that a nanosecond is extremely small. It is a big number, but it an extremely small unit of time.

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## #24 2006-09-27 11:04:09

justlookingforthemoment
Moderator
Registered: 2005-05-26
Posts: 2,161

### Re: 10 second questions

Devanté wrote:

It's e not e!.

Yeah, I knew someone would write that, because I wrote it in a maths project once.

Something like, 'And that shows that the height of the cube is x!'

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## #25 2006-09-28 03:19:10

Devantè
Real Member
Registered: 2006-07-14
Posts: 6,400

### Re: 10 second questions

I also did something like that. Never put emotion into your math - The teacher doesn't look upon it very kindly.

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