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Nursing 131 Household to Metric Conversion

Nursing 131 Household to Metric Conversion

Slide 2 & 3

Household/Metric Conversion

In the metric system liquid volumes are measured in milliliters or liters. Weight is measured in micrograms, milligrams, grams, or kilograms.

1 liter1000 milliliter

1 kilogram

1,000,000 milligrams

1,000 grams

1,000,000,000 micrograms

In the household system liquid volumes are measured in quarts, pints, cups, tablespoons, and teaspoons. Weight is measured in ounces & pounds.

1 quart2 pints64

tablespoons 192
teaspoons4 cups

16 ounces1 pound

Household/Metric Conversion

Nursing 131 Household to Metric Conversion

Slide 4 & 5 Example One

yOur First Example Problem: y2 ½ teaspoons of cough medicine has been prescribed. A measuring device marked in ml is being used. How many ml should be administered?

Household/Metric Conversion

Here are the 5 basic steps to change from one unit to another

Step 5 ȂPerform the math

Step 2 ȂWrite down what you have

Step 1 -Identify that you need to convert

Step 3 ȂWrite down your equivalent fraction

Step 4 ȂReduce units

Household/Metric Conversion

__________

Nursing 131 Household to Metric Conversion

Slide 6 Solution to Example One

yOur Example Problem: y2 ½ teaspoons of cough medicine has been prescribed. A measuring device marked in ml is being used. How many ml should be administered?

Step 1Identify you need to convert

The question asks how many of one unit should we prepare in another type of unit.

Step 2Write down what you have

The quantity we have our known quantity -is 2 ½ tsp. (teaspoons)

Write this as a fraction with 1 on the bottom.

(Writing the amount as a fraction will help us when we multiply later.)

2 ½ tsp

1

Metric/Household Conversion

yOur Example Problem: y2 ½ teaspoons of cough medicine has been prescribed. A measuring device marked in ml is being used. How many ml should be administered?

Step 3Relate the units

An equivalency chart will list how the units relate.

Household/Metric Conversion

Conversions between Household and Metric Units

1 quart1 liter (l)

1 pint500 milliliters (ml)

1 cup240 milliliters (ml)

1 fluid ounce (oz.)30-32 milliliters (ml)

1 tablespoon(tbsp.)15 milliliters (ml)

1 teaspoon (tsp.)5 milliliter (ml)

2.2 pound (lbs)1 kilogram (kg)

Household/Metric Conversion

Step 3Relate the units

We now have:

X To convert we will need to multiply our fractions.

2 ½ tsp

1 5 ml 1 tsp

Household/Metric Conversion

Step 4Reduce the units

Cross off any matching pairs of unit labels. The label left should be what you want to find.

We now have:

In this example the only unit left is ml which is what we want to find.

We now have:

x2 ½ tsp 1 5 ml 1 tsp

Household/Metric Conversion

Step 5Perform the math

2 ½ teaspoons is equivalent to 12.5 ml.

x

2 ½ x 5

1 x 1 12.5 1 12.5

2 ½ tsp

1 5 ml 1 tsp watch the Operations with Mixed Numbers tutorial.

Household/Metric Conversion

(Reduce any fractions.) ml

Nursing 131 Household to Metric Conversion

Slide 14 Example Two

yOur Second Example Problem: yA child weighs 24 lbs, 14 oz. You determine that 24 lbs., 14 oz. is equivalent to ______ kg.

Household/Metric Conversion

__________

Nursing 131 Household to Metric Conversion

Slide 15-19 Solution to Example Two

yOur Second Example Problem: yA child weighs 24 lbs, 14 oz. You determine that 24 lbs., 14 oz. is equivalent to ______ kg.

Step 1Identify you need to convert

Step 2Write down what you have

The quantity we have is in 2 different units. We have 24 lbs and we have

14 oz. We first change the 14 oz to lbs by dividing by 16.

We then add this to the 24lbs. Use a calculator or long division to change the 14/16 to a decimal. We can then write this as a fraction with 1 on the bottom. 14 16 + 24= 24.87524.875 1

Household/Metric Conversion

yOur Second Example Problem: yA child weighs 24 lbs, 14 oz. You determine that 24 lbs., 14 oz. is equivalent to ______ kg.

Step 3Relate the units

An equivalency chart will list how the units relate.

Household/Metric Conversion

Conversions between Household and Metric Units

1 quart1 liter (l)

1 pint500 milliliters (ml)

1 cup240 milliliters (ml)

1 fluid ounce (oz.)30-32 milliliters (ml)

1 tablespoon(tbsp.)15 milliliters (ml)

1 teaspoon (tsp.)5 milliliter (ml)

2.2 pound (lbs)1 kilogram (kg)

Household/Metric Conversion

Step 3Relate the units

An equivalency chart will list how the units relate.

We can write this fraction 2 ways:

We will write this equivalency as a fraction.

or Because the fraction we wrote in step 2 has lbs on the top, our next fraction must have lbs on the bottom.

Our chart lists 1 kg = 2.2 lbs.

1 kg__

2.2 lbs

2.2 lbs

1 kg

Household/Metric Conversion

Step 3Relate the units

We now have:

x To convert we will need to multiply our fractions.

1 kg__

2.2 lbs

24.875 lbs

1

Household/Metric Conversion

Nursing 131 Household to Metric Conversion

Slide 20-21 Solution to Example Two (Continued)

We now have:

x1 kg__

2.2 lbs

24.875 lbs

1

Step 4Reduce the units

Cross off any matching pairs of unit labels. The label left should be what you want to find. In this example the only unit left is kg which is what we want to find.

Household/Metric Conversion

Step 5Perform the math

24 lbs, 14 oz. is equivalent to 11.3 kg.

24.875 x 1

1 x 2.2

_24.875_ 2.2

11.30682

x

1 kg__

2.2 lbs

24.875 lbs

1 When converting from lbs to kg round your result to the nearest tenth. = (Reduce any fractions.)

Household/Metric Conversion

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