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

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**morik****Member**- Registered: 2005-11-23
- Posts: 16

Hey, I study computing and have a small Math module to do over the weekend. (The most feared unit on all my course for me as I never have had a good mind for maths.

Anyway, here are some questions that are bugging me...

Could anyone please tell me either the answers and/or the steps of working them out?

1. (Please note the cubed symbols have minus' before them in this one) Calculate 2 x 10-³ x 3 x 10-³

2. Binary to denary conversion. Convert 11111110 divided by 2

3. Calculate: 22 1/3rd

¯¯¯¯¯¯¯

3 3/8ths

4. Calculate 22 1/3 - 3 3/8

5. (22 1/3 / 3 3/8) + 22 1/3

Thanks for taking time to help

Dani

Offline

**ganesh****Administrator**- Registered: 2005-06-28
- Posts: 25,595

Answers:-

1. 6 x 10^(-6) i.e. 6 x 1/100,000 = 0.000006

2. Question not clear. Is it convert 11111110 into binary, then divide by 2?

3. 22 1/3 = 67/3, 3 3/8 = 27/8; 67/3 divided by 27/8 is

67/3 x 8/27 = 536/81.

4. 67/3 - 27/8 = [536-81]/24 = 455/24

5. Result of 3 + 22 1/3 = 536/81 + 67/3 = [536*3 + 81*67]/243

= 7035/243 = 2345/81

[*** in a hurry...didn't check for errors!***]

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

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

Offline

**morik****Member**- Registered: 2005-11-23
- Posts: 16

That's awesome. Thanks a lot for that speedy reply. Don't worry about that binary question. I think i sussed it.

Offline

**mathsyperson****Moderator**- Registered: 2005-06-22
- Posts: 4,900

I think the binary one is 11111110 (bin) ÷ 2(dec) = ?(dec)

Anyway, 2 in binary is 10 and so the first part is really easy, you just knock off the 0.

11111110 ÷ 10 = 1111111.

Then, to convert that into decimal, assign each 1 its power-of-2 value.

1111111 --> 1+2+4+8+16+32+64 = 127.

Why did the vector cross the road?

It wanted to be normal.

Offline

Pages: **1**