Step 1: The exponent for 10 is -88. Since the exponent is negative, we must move the decimal point of a number 1.8 88 places to the left.

1.8 → .---------------------------------------------------------------------------------------1.8

Step 2: Now we just need to replace empty spaces (dashes) with zeros and to delete old decimal point (the black one) to get:

.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000018