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Adding the inches column, we obtain 18 in = 1 ft 6 in. So we put down 6 in in the inches column, and
carry 1 ft to the top of the feet column:
{1ft}
6ft 8 in
+11 ft 10 in
6in
We add up the feet column to obtain the final answer:
{1ft}
6ft 8 in
+11 ft 10 in
18 ft 6 in
The total length, in proper form, is 18 ft 6 in.
3.11.4 Exercises
1. A carpenter cuts a 6 ft 7 in piece from a 9 ft 4 in board. What is the length of the leftover piece?
2. Find the perimeter of the polygon:
4ft 2 in
6ft 7 in
4ft 8 in
3ft 8 in 2ft 6 in
1
3. A film critic watched three movies. The first was 2 hrs, the second 2 hrs 15 min, and the last 1
2
hr 45 min. (a) What was the total length of the movies? (b) What was the average length of the
movies?
3.12 Signed fractions
Every point on the number line represents a number. In this regard, there is nothing special about
fractions. Each nonzero fraction has an opposite lying at the same distance from, but on the other side
of 0.
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