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This chapter focuses on the methods for accurately adding and subtracting measurements expressed in feet and inches. Through examples, such as adding 4 ft 7 in to 2 ft 10 in, we demonstrate the process of adjusting units when total inches exceed 12. You'll learn to convert inches to feet as needed. Similarly, for subtraction, we address situations requiring borrowing, like subtracting 2 ft 8 in from 11 ft 6 in, guiding you through the necessary steps to ensure precise calculations.
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Adding and Subtracting Measurement Chapter 6 Section 12
How do we add measurement? • Example: 4 ft 7 in • + 2 ft 10 in • Add like normal 6 ft 17 in • 17 inches? We can’t have that since 17 inches is bigger than 12 inches. See our BFF just to be sure. • Change 17 inches into feet and inches • Take 17 ÷ 12 and find a remainder. • So 1 ft 5 in and add that to 6 ft • 6 ft • + 1 ft 5 in • 7 ft 5 in
What about subtraction? • Example: 11 ft 6 in • - 2 ft 8 in • Can we subtract 6 and 8? • We need to borrow! How many do we borrow? • Right we have to borrow 12 inches since we are taking it from 1 foot! • Add the 12 inches to the 6 inches there • And now subtract like normal!
Let’s try some together • 1) 8 ft 4 in 2) 11 ft 5 in+ 7 ft 11 in- 9 ft 10 in
