Changing Units in the Customary System

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Changing Units in the Customary System

• Lesson 5-8

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(No Transcript)
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Strategy

• When converting from a large unit to a small
  unit, multiply by the conversion factor.
• When converting from a small unit to a larger
  unit, divide by the conversion factor.

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Small - - - - - - - - Large
Inch (in) ---------- Foot (ft)-------- Yard (yd)
------- Mile (mi)
Ounce (oz) -------------- Pound (lb)
-------------Ton (t)
Fluid Ounce (fl. oz.) -- Cup (c) -- Pint (pt) --
Quart (qt) -- Gallon (gal)
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Changing Units

• Determine the direction of the change (L?S or
  S?L)
• Multiply or Divide by the appropriate conversion
  unit.

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Example
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12 gal ______ qt
L ? S
x
12
4
(1 gal 4 qt)
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Example 2
40 in ______ ft
S ? L

40
12
We can divide fractions so that remainders can be
described as fractions.
1
1
10
x
40
1
1
12
3
10
3
1

3
3
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Computing With Units

• Combine or subtract like units.
• Regroup.

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1 foot 12 inches
8 feet 7 inches - 5 feet 11 inches
2 feet 8 inches
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Homework Time