The answer to 3 feet 10 inches plus 8 feet 9 inches (3' 10" + 8' 9") is displayed below:
12 feet 7 inches
Here is how we calculated 3 feet 10 inches plus 8 feet 9 inches to get the answer above:
First, we converted feet to inches so we are only dealing with inches.
3 feet 10 inches = 46 inches
8 feet 9 inches = 105 inches
Then, we added the inches together to get the total number of inches:
46 + 105 = 151 inches.
Finally, we converted 151 inches into feet and inches to get the answer.
3' 10" + 8' 9" = 12' 7"
Note: There are 12 inches in a foot. Thus, you multiply feet by 12 to get only inches, and
to make it back to feet and inches we divided total number of inches by 12.
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