When subtracting fractional inches how do you do it when you borrow?
UCL Graduate in Pharmaceutics with 3 years of tutoring experience
For example: 8' 4" - 3' 9" = ? We can't do 4" - 9". We'll take one foot from 8' and change it to inches. We'll add it to the 4 to give us inches greater than 9" to make our subtraction easier. Remember, there are 12" in 1 foot. So, we took one from 8' so it becomes 7 and we then added the inches to 4 so it becomes 16. Now we have 7' 16". We can then easily do the Maths: 7' 16" - 3' 9" = 4' 7" This is the same as the original question 8' 4" - 3' 9" = 4' 7"
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