10 to the 18th power over 10 to the 8th power
To calculate this expression, you can divide the numerator by the denominator, which in this case means subtracting the exponent:
10^18 / 10^8 = 10^(18-8) = 10^10.
Therefore, 10 to the 18th power divided by 10 to the 8th power is equal to 10 to the 10th power.