Compute Customary Units
6-3
Last month a sunflower was
4 feet 7 inches tall. Then it grew
1 foot 8 inches taller. How tall
is the sunflower now?
To find how tall it is now,
add: 4 ft 7 in. 1 ft 8 in.
Add the smaller units first. Rename units as needed.
4 ft 7 7 in.
1 ft 7 8 in.
5 ft 15 in. 5 ft 1 ft 3 in.6 ft 3 in.
The sunflower is 6 ft 3 in. tall now.
A lilac stem was 7 feet 7 inches tall.
Sam pruned 2 feet 5 inches off the stem.
How tall was the stem after pruning?
To find how tall, subtract: 7 ft 7 in. 2 ft 5 in.
Subtract the smaller units first. Rename units as needed.
7 ft 7 in.
2 ft 5 in.
5 ft 2 in. The stem was 5 ft 2 in. tall after pruning.
Study these examples.
1 8 yd 1 ft 4 ft 11 in.
1 2 yd 2 ft 4 ft 19 in.
10 yd 3 ft 10 yd 1 yd11 yd 4 ft 1 2 in.
15 in.12 in.3 in.
1 ft3 in.
3 ft1 yd
3.0
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