Please convert 149600000000 metres in standard form

I assume you meant "scientific notation"

You need the decimal after the first digit, so
1.493
How many places did I move the decimal? 11 to the left, so ...

149600000000 metres = 1.493 x 10^11 metres

To convert 149,600,000,000 meters to standard form, you need to move the decimal point to a position where there is only one non-zero digit to the left of it.

Starting with 149,600,000,000, we need to move the decimal point 11 places to the left to have only one non-zero digit to the left of it.

Therefore, the number in standard form is 1.496 × 10^11 meters.