Step 1: Move the decimal point from its current position (the black dot) to a position immediately to the right of the first nonzero digit (the red dot).
0.0000002.9
Step 2: We moved the decimal point 7 spaces to the left. Therefore, the exponent on base 10 will be negative 7.Now we know that the:
Mantissa = 2.9
Exponent = -7
So, the solution is:
$$0.00000029 = \color{blue}{ 2.9} \cdot 10^{ \color{red}{ -7 }}$$