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# Simple but confusing standard form question? watch

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1. The question is telling me to calculate the volume for red blood cells per litre for males in standard form.

It tells me that there are 5.4 million per ml.
How many are there per litre in standard form?
2. (Original post by SHBKhan)
The question is telling me to calculate the volume for red blood cells per litre for males in standard form.

It tells me that there are 5.4 million per ml.
How many are there per litre in standard form?
Start by working out how many ml there are in a litre
3. (Original post by Neuth)
Start by working out how many ml there are in a litre
Yeah 1000. But it's the standard form part and answer which confuse me. It's asking for standard form so do I write 5.4 x 10^6 ÷ 10^3 or something else
4. 5.4 x 10^9 I think as 5.4 million is 5.4 x 10^6 and 1000ml in a litre so 10^3. 10^6 x 10^3 = 10^9

Answer 5.4 x 10^9 I think while checking on calculator 96% sure thats right
5. (Original post by SHBKhan)
x
If there are 5.4 million per ml, there are 5400000 per ml, yes?
So that's 5400000000 per litre.

What is 5400000000 in standard form?
6. (Original post by EnterNamehereplz)
5.4 x 10^9 I think as 5.4 million is 5.4 x 10^6 and 1000ml in a litre so 10^3. 10^6 x 10^3 = 10^9

Answer 5.4 x 10^9 I think while checking on calculator 96% sure thats right
I did that in lesson and was told it was wrong. Apparently I have to divide to obtain a 'smaller' number so it would become a litre.

(Original post by Neuth)
If there are 5.4 million per ml, there are 5400000 per ml, yes?
So that's 5400000000 per litre.

What is 5400000000 in standard form?
5.4 x 10^9
Right but I was told that was incorrect by my teacher which is why I am confused.
7. (Original post by SHBKhan)
Apparently I have to divide to obtain a 'smaller' number so it would become a litre.
But then it wouldn't be in standard form...?
8. (Original post by Neuth)
But then it wouldn't be in standard form...?
I knowww :/
9. (Original post by SHBKhan)
The question is telling me to calculate the volume for red blood cells per litre for males in standard form.

It tells me that there are 5.4 million per ml.
How many are there per litre in standard form?
(Original post by SHBKhan)
I did that in lesson and was told it was wrong. Apparently I have to divide to obtain a 'smaller' number so it would become a litre.

5.4 x 10^9
Right but I was told that was incorrect by my teacher which is why I am confused.
(Original post by Neuth)
But then it wouldn't be in standard form...?
Quoting Neuth in just cause I can see she's as confused

5.4 million is

How many litres in a mililitre?
Spoiler:
Show
0.001, which is the same as LaTeX is annoying and can't cope with negative powers
So:
Spoiler:
Show

Spoiler:
Show
10. (Original post by Andy98)
Quoting Neuth in just cause I can see she's as confused

5.4 million is

How many litres in a mililitre?
Spoiler:
Show
0.001, which is the same as LaTeX is annoying and can't cope with negative powers
So:
What was that last spoiler? It won't open lol
11. (Original post by Andy98)
Quoting Neuth in just cause I can see she's as confused
12. (Original post by SHBKhan)
What was that last spoiler? It won't open lol
You multiply the 5.4 million by 10^(-3)
13. (Original post by Neuth)
5.4*10^6*10^(-3)=the number of red blood cells per litre
14. (Original post by Andy98)
5.4*10^6*10^(-3)=the number of red blood cells per litre
Oh OK. And that is how it's written completely in standard form?
15. (Original post by SHBKhan)
Oh OK. And that is how it's written completely in standard form?
What's equal to?
16. (Original post by Andy98)
What's equal to?
10^9
So 5.4 × 10^9?
17. (Original post by SHBKhan)
10^9
So 5.4 × 10^9?
6-3 isn't 9
18. (Original post by Andy98)
0.001, which is the same as LaTeX is annoying and can't cope with negative powers
$$10^{-3}$$ .

LaTeX only reads one character after ^(or _, \sqrt, \frac(in which case it'll read the first two characters as the arguments), \dfrac(same as previous), some others) before returning to normal formatting. Putting curly brackets overrides this so you can tell it to read more than one character.
eg.
19. (Original post by Andy98)
6-3 isn't 9
Oh I didn't see negative. Well yeah 3. So 5.4 x 10^3?

Posted from TSR Mobile
20. (Original post by morgan8002)
$$10^{-3}$$ .

LaTeX only reads one character after ^(or _, \sqrt, \frac(in which case it'll read the first two characters as the arguments), \dfrac(same as previous), some others) before returning to normal formatting. Putting curly brackets overrides this so you can tell it to read more than one character.
eg.
Ahhhh

(Original post by SHBKhan)
Oh I didn't see negative. Well yeah 3. So 5.4 x 10^3?

Posted from TSR Mobile
That's right

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