Gcse maths standard form

(a) Write the following in standard form:
(i) 156,700,000 = ………………………………………..
(ii) 0.000341 = …………………………………..….….. .. (1 mark)
(b) Write the following without standard form:
(i) 2.6 × 105 = …………………………………..….…..
(ii) 9.02 ×10-3 = ……………………………………….. (1 mark)

can someone explain this to me i don't understand standard form

Ai)1.567x10^8
Aii)3.41x10^-4

Bi)260,000
Bii)0.00902

It it's a positive 'to the power of' you move the decimal place forward, it it's negative, you move it back.

(a)-
i) = 1.567 X 10(to the power of eight) -i don't know the keyboard shortcut for powers.
ii)= 3.41 X 10(to the power of minus four)