Changing Units in the Customary System. Strategy When converting from a large unit to a small unit,...

Changing Units in the Customary System

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.

Small - - - - - - - - LargeInch (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)

Changing Units Determine the direction of the change (LS or SL)

Multiply or Divide by the appropriate conversion unit.

Example12 gal = ______ qt

L S

x12 4 (1 gal = 4 qt)

48

Example 240 in = ______ ft

S L÷40 12

3 13

Example 3 12 q = ______ c = ______ fl oz

12 x 4 = 48

48 x 8 = 384

Example 4 Comparing Convert to the same units then compare.

18 ft ______ 220 in

Convert: 18 x 12 = 216 in

Or Convert 220 ÷ 12 = 18.3 ft

18 ft ___<___ 220 in

Practice• 9ft = in

•10pt = qt

•24 fl oz = c

•32 qt = gal

•3T = lb

•3yd = in

•108

•5

•3

•8

•6000

•108

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