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# GCSE Maths question Watch

1. What's the answer to this and why?
2. =24 x 10^15
=2.4 x 10^16
3. With multiplication or division you just do each bits separately so

6x4 = 24
10^7x10^8 = 10^15 cause you add the powers

so
24x10^15 but the number at the front (24) has to be be bigger than 1 and less than 10.
so
2.4 x 10^16
4. I think it is 2.4x10^(16)

I multiplied 6 by 4 and then 10^8 by 10^7, which using Index Laws means add, that gives you 24x10^15. That isn't standard form as this has to be between 1-10, so it becomes 2.4x10^16 for the additional decimal place.

Hope that was of help.
5. (Original post by epoddoulc)
What's the answer to this and why?
2.4*10^16

Think of it this way :: 6 x 4 x 10^8 x 10^7 = 24 x 10^(8+7) = 24 x 10^15. since standard form is only 1 to 9.9*10^n then the answer should be 2.4 x 10^16.

Hope that was of help

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