Page 437 - Basic College Mathematics with Early Integers

414 C HAPTE R 5 I RATIO, PROPORTION, AND MEASUREMENT

PRACTICE 7 Example 7 Convert 0.185 dl to milliliters.
Convert 2.13 dal to liters.
Solution: We list the unit measures in order from left to right and move from
deciliters to milliliters.
kl hl dal L dl cl ml
2 units to the right
0.185 dl=18.5 ml
2 places to the right
Work Practice 7

Objective Performing Operations on Metric
System Units of Capacity

As was true for length and weight, arithmetic operations involving metric units of
capacity can also be performed. Make sure that the metric units of capacity are the
same before adding or subtracting.

PRACTICE 8 Example 8 Add 2400 ml to 8.9 L.
Add 1250 ml to 2.9 L.
Solution: We must convert both to liters or both to milliliters before adding the
capacities together.

2400 ml=2.4 L or 8.9 L=8900 ml

2.4 L 2400 ml
+ 8.9 L + 8900 ml
11.3 L 11,300 ml

The total is 11.3 L or 11,300 ml.They both represent the same capacity.
Work Practice 8

Concept Check How could you estimate the following operation? Subtract
950 ml from 7.5 L.

PRACTICE 9 Example 9 Finding the Amount of Medication a Person Has Received
If 28.6 L of water can be
pumped every minute, how A patient hooked up to an IV unit in the hospital is to receive 12.5 ml of medica-
much water can be pumped in tion every hour. How much medication does the patient receive in 3.5 hours?
85 minutes? Solution: We multiply 12.5 ml by 3.5.
medication per hour : 12.5 ml

* hours : * 3.5
total medication 625
Answers 3750
7. 21.3 L 8. 4150 ml or 4.15 L 43.75 ml Copyright 2012 Pearson Education, Inc.
9. 2431 L
The patient receives 43.75 ml of medication.
Concept Check Answer
Work Practice 9
950 ml = 0.95 L; round 0.95 to 1;
7.5 - 1 = 6.5 L