Measurement

Units of Weight/Mass

Before we get to the gory details, let’s just talk about the size of the units.

What unit would you use to measure the weight of a box of pasta?

pounds or ounces

What unit would you use to measure the weight of a car?

What unit would you use to measure the weight of a letter?

tons

ounces

Basic Equivalences – Weight/Mass1 pound = 16 ounces1 ton = 2,000 pounds

Basic Equivalences 1 pound = 16 ounces1 ton = 2,000 pounds

How many pounds is 40 ounces?

We are going from a smaller measure (ounces) to a larger measure (pounds)

so we have to divide.

pounds

To change a measurement from a larger unitto a smaller unit– multiply

To change a measurement from a smaller unit to a larger unit– divide

Basic Equivalences 1 pound = 16 ounces1 ton = 2,000 pounds

How many tons is 9280 pounds?

To change a measurement from a larger unitto a smaller unit– multiply

To change a measurement from a smaller unit to a larger unit– divide

We are going from a smaller unit (pounds) to a larger unit (tons),

therefore divide.

tons

Basic Equivalences 1 pound = 16 ounces1 ton = 2,000 pounds

How many ounces is 3.25 pounds?

We are going from a larger unit (pounds)to a smaller unit (ounces)

therefore multiply.

ounces

To change a measurement from a larger unitto a smaller unit– multiply

To change a measurement from a smaller unit to a larger unit– divide

Basic Equivalences 1 pound = 16 ounces1 ton = 2,000 pounds

How many pounds is 3.45 tons?

We are going from a larger unit (tons)to a smaller unit (pounds)

therefore multiply.

pounds

To change a measurement from a larger unitto a smaller unit– multiply

To change a measurement from a smaller unit to a larger unit– divide

Basic Equivalences 1 pound = 16 ounces1 ton = 2,000 pounds

How many ounces is 0.12 tons?

We are going from a larger unit (tons) to a smaller unit (ounces), therefore multiply.

But we don’t have a conversion factor for tons to ounces, so first we have to convert the tons to pounds!

pounds ounces

To change a measurement from a larger unitto a smaller unit– multiply

To change a measurement from a smaller unit to a larger unit– divide

Units of Capacity (liquid)

Standard Equivalences – Capacity/Volume

1 gallon = 4 quarts

1 quart = 2 pints

1 pint = 2 cups

1 cup = 8 fluid ounces

What unit would you use to buy nail polish? Fluid ounces

What unit would you use to fill your car with gas?

What unit would you use to measure coffee for a party?

Gallons

Depends on the party.

How many quarts is 6 pints?

We are going from a smallert unit (pints) to a larger unit (quarts),

therefore divide.

pints

Standard Equivalences – Capacity1 gallon = 4 quarts1 quart = 2 pints1 pint = 2 cups

1 cup = 8 fluid ounces

To change a measurement from a larger unitto a smaller unit– multiply

To change a measurement from a smaller unit to a larger unit– divide

How many ounces is 7 cups?

We are going from a larger unit (cups) to a smaller unit (ounces),

therefore multiply.

7 x 8 ounces

Standard Equivalences – Capacity1 gallon = 4 quarts1 quart = 2 pints1 pint = 2 cups

1 cup = 8 fluid ounces

To change a measurement from a larger unitto a smaller unit– multiply

To change a measurement from a smaller unit to a larger unit– divide

How many ounces is 1.5 quarts?

We are going from a larger unit (quarts) to a smaller unit (ounces), therefore multiply.

But we don’t have a conversion factor for quarts to ounces, so first we have to turn quarts into pints, and pints into

cups, and cups into ounces.

1.5 quarts x 2 = 3 pints3 pints x 2 = 6 cups

6 cups x 8 = 48 ounces

Standard Equivalences – Capacity1 gallon = 4 quarts1 quart = 2 pints1 pint = 2 cups

1 cup = 8 fluid ounces

To change a measurement from a larger unitto a smaller unit– multiply

To change a measurement from a smaller unit to a larger unit– divide

How many gallons is 23 cups?

We are going from a smaller unit (quarts) to a larger unit (ounces), therefore divide.

But we don’t have a conversion factor for gallons to ounces,

so first we have to turn quarts into pints, and pints into cups, and cups into ounces.

Standard Equivalences – Capacity1 gallon = 4 quarts1 quart = 2 pints1 pint = 2 cups

1 cup = 8 fluid ounces

To change a measurement from a larger unitto a smaller unit– multiply

To change a measurement from a smaller unit to a larger unit– divide

How many gallons is 23 cups?

= 11.5 pints

= 5.75 quarts

= 1.4375 gallons

Standard Equivalences – Capacity1 gallon = 4 quarts1 quart = 2 pints1 pint = 2 cups

1 cup = 8 fluid ounces

To change a measurement from a larger unitto a smaller unit– multiply

To change a measurement from a smaller unit to a larger unit– divide

To change a measurement from a larger unitto a smaller unit– multiply

To change a measurement from a smaller unit to a larger unit– divide

If there is no direct conversion factor,You will have to go through intermediate steps

to complete the conversion.