Changing Units in the Customary System Lesson 3

Changing Units in the Customary System Lesson 3 -6

Brainpop Quiz Customary Units http: //www. brainpop. com/math/numbersa ndoperations/customaryunits/ www. brainpop. com

1. C 2. A 3. D 4. B 5. B 6. D 7. D 8. A 9. C 10. C Answers

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)

Changing Units • Determine the direction of the change (Large Small or Small Large) • Multiply or Divide by the appropriate conversion unit. – L S then multiply – S L then divide

Example 48 12 gal = ______ qt L S 12 x 4 MULTIPLY (1 gal = 4 qt)

Example 2 40 in = ______ ft S L 40 ÷ 12 1 1 10 40 x 1 1 12 3 10 3 = 3 We can divide fractions so that remainders can be described as fractions. 1 3

10 2/3 yd 10 yd 2 ft = ______ Small to Large (ft to yd) Divide Keeps yards the same 2/3

Computing With Units • Combine or subtract like units. • Regroup. 19 7 8 feet 7 inches - 5 feet 11 inches 2 feet 8 inches 1 foot = 12 inches

Homework Time Pg. 150 #2 -28 even 10 -28 write if you’re going S ->L or L->S, and if multiply or divide

Bellringer MUST SHOW YOUR WORK!!!!! 1)6 ½ ÷ 1 ½ = 2)3 2/3 X 1 ½ = 3)9 1/6 + 6 ¼ = 4)9 – 5 5/6 =

Practice customary systems Practice sheet 3 -6 odds go over

Homework • Practice sheet 3 -6 #1 -26 evens (for 8 -22 show work, simplified, and mixed numbers)