Simple but confusing standard form question?

(edited 3 years ago)

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 :fluffy:

Reply 2

username2241393

Original post by Neuth

Start by working out how many ml there are in a litre :fluffy:

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

Reply 3

Neuth

Original post by SHBKhan

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?

Reply 4

username2241393

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.

Reply 5

Neuth

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...?

Reply 6

username2241393

Original post by Neuth

But then it wouldn't be in standard form...?

I knowww :/

Reply 7

Andy98

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

5.4\times 10^6

How many litres in a mililitre?
Answer:

Spoiler

So:

Spoiler

(edited 8 years ago)

Reply 8

username2241393

Original post by Andy98

Quoting Neuth in just cause I can see she's as confused

5.4 million is

5.4\times 10^6

How many litres in a mililitre?
Answer:

Spoiler

So:

What was that last spoiler? It won't open lol

Reply 9

Neuth

Original post by Andy98

Quoting Neuth in just cause I can see she's as confused

I'm just confused about what the teacher is asking for :lol:

Reply 10

Andy98

Original post by SHBKhan

What was that last spoiler? It won't open lol

You multiply the 5.4 million by 10^(-3)

Reply 11

Andy98

Original post by Neuth

I'm just confused about what the teacher is asking for :lol:

5.4*10^6*10^(-3)=the number of red blood cells per litre

Reply 12

username2241393

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?

Reply 13

Andy98

Original post by SHBKhan

Oh OK. And that is how it's written completely in standard form?

What's

\frac{10^6}{10^3}

equal to?

Reply 14

username2241393

Original post by Andy98

What's

\frac{10^6}{10^3}

equal to?

10^9
So 5.4 × 10^9?

Reply 15

Andy98

Original post by SHBKhan

10^9
So 5.4 × 10^9?

6-3 isn't 9 :s-smilie:

Reply 16

username1560589

Original post by Andy98

0.001, which is the same as

\frac{1}{10^3}

LaTeX is annoying and can't cope with negative powers

[NOPARSE]

10^{-3}

[/NOPARSE]

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.