Answer: 420,085
Step-by-step explanation
Start by writing 400,000.
The 20,000 means 2 goes in the ten-thousands digit. So we'll replace the first 0 with 2.
The 80 means 8 goes in the tens place value. We replace the second to last 0 with 8. Then finally, replace the last 0 with 5 because of the +5 at the very end.
There are two zeros that are left intact because we do not have anything in the thousands place value nor the hundreds place value either.
When reading this number out loud it is: "four hundred twenty thousand, eighty five". We do not place "and" anywhere in that sentence because "and" refers to a decimal point.
Example: 2.75 = two and seventy five hundredths