'No calculator question'

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Q). Write 2(to the power of 25) x 5 (to the power of 27) in standard form.

Is there a way to do this more easily without a calculator?

It's a 3 mark question so should be done in 3 minutes or so I assume?

I understand the answer is 2.5x10(to the power of 26) but edexcels revision booklet doesn't give any information on how to even approach this.

Thanks!

Guest Oct 29, 2017

CPhill · Answer 1 · 2017-10-29T06:18:10

2^25 * 5^27

Note that we can write this in the following manner

[2 * 5 ]^25 * 5^2 =

[10]^25 * 25 =

25 x 10^25 =

2.5 x 10^26 [ in scientific notation ]

Guest · Answer 2 · 2017-10-29T06:36:21

And... how much would I have to pay you to do my maths exam? :') thanks CPhill

CPhill · Answer 3 · 2017-10-29T06:43:11

I work cheap.....LOL!!!!

Unfortunately....I can't guarantee that you will pass........!!!!