Changing Units in the Customary

System

Lesson 3-6

Brainpop Quiz

Customary Units

http://www.brainpop.com/math/numbersandoperations/customaryunits/

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Answers1. C

2. A

3. D

4. B

5. B

6. D

7. D

8. A

9. C

10.C

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 (LargeSmall or SmallLarge)

• Multiply or Divide by the appropriate conversion unit.– LS then multiply– SL then divide

Example

12 gal = ______ qt

L S MULTIPLY

x12 4 (1 gal = 4 qt)

48

Example 2

40 in = ______ ft

S L÷40 12

We can divide fractions so that remainders can be described as fractions.

1 1

x40 11 12

10

3

103 = 3 1

3

10 yd 2ft = ______ yd

Keeps yards the same2 / 3

Small to Large (ft to yd)DivideDivide

10 2/310 2/3

Computing With Units• Combine or subtract like units.• Regroup.

8 feet 7 inches

- 5 feet 11 inches

7 1 foot = 12 inches19

2 feet 8 inches

Homework Time

Pg. 150 #2-28 even

10-28 write if you’re going 10-28 write if you’re going S->L or L->S, and if multiply S->L or L->S, and if multiply

or divideor divide

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 =

Bellringer

Practice customary systemsPractice sheet 3-6 odds go over

Homework

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